Private Instruction vs. Group Classes
- What’s the difference between private instruction and group classes?
- How much are group classes versus independent instruction?
- Are there any costs not included with this payment?
- Do you have a student agreement?
- Group classes aren't always less expensive and private instruction is not always more expensive...
- Who's going to be your instructor?
- Will my instructor be female or male?
- Does it matter which certification agency the dive shop or the instructor teaches through?
- How deep will the certification be good to?
- Are my skill transferable to another agency?
- Are there any skills not taught by this agency?
- Will my certification require certification dives?
- How many certification dives are required?
- Will I be certified to dive autonomously or only under direct supervision from a dive professional?
- Is any equipment required to be purchased?
- What is the transfer process from junior diver to autonomous diver?
- Ask the instructor if they are affiliated with a dive shop or are independent...
- Does the instructor pay their own insurance or does the shop?
- Do you get an hourly wage, commission, or salary?
- Will anyone be assisting in the training and what are their qualifications?
- How long has the instructor been diving?
- How many dives have they logged?
- Where have they done most of your diving?
- What other qualifications do they have?
- If the dive shop offers training from various training agencies, what standards are followed?
- Does everyone pass?
- If a student doesn't pass, what happens?
- Learn to dive for yourself, not be pressured into learning for another...
- Who's the Barber, here?
- Will the student get an opportunity to do a dive with just their dive buddy after completion of the last cert dive?
- Are you building a dive community that I can be a part of?
- What is different between the Junior Diver and Autonomous Diver programs?
- How many children will be in the water at any one time when teaching Junior Divers?
As I write this outline first, and as always happens, trying to create a 5 or 10 minute video ends up having a life of it's own. I could always limit what I want to deliver to those that might read or watch this later but I think of the videos like I do my education. Quality always comes first! Content will never be taken out in order to fit in more people.
I understand that many reading or watching feel they are pressed for time. However, please consider that you don't know what you don't know and when it comes to breathing underwater, sometimes that extra time one didn't invest could be the wrong decision. Scuba after all is inherently dangerous... Learn to be a great diver from the beginning!
I received my certification from a dive instructor that owned a little shop in Las Vegas. When I walked in and told him that I wanted to learn how to dive, I actually believe he was surprised. I've found that many dive shop owners are retired from lengthy careers in other walks of life and are sometimes looking for a quiet place to hang out and occasionally do something to bring in a little cash or at the very least, burn a few hours.
I knew that I was going to into it with an all or nothing attitude, so I even decided to buy equipment. I think that was the biggest surprise to him. So, after I had to convince him to take my money, I got fitted for all the equipment and began my life of scuba! It turned out that there was one other student in my class, but after we finished the program, I never heard from him again.
I didn't seem to get the enthusiasm from him about scuba I wanted so I wandered to another shop and their attitude wasn't much better. They too seemed preoccupied with the things they needed to work on rather than getting to know the customer, the student, build relationships, and didn't really even want to sell me anything.
I ended up only taking one class from them, and moved again. It's at this time that I really started to wonder if scuba divers, dive shops, or instructors actually liked to dive or they were crazy. I think it's no exaggeration to say that dive shop owners are quite an eccentric bunch. Compared to all other businesses, at this point it didn't seem that awkward that I wasn't happy with their business models. This was Las Vegas, after all. Vegas has it's own eccentricities to say the least.
The next shop I went to wasn't PADI. It was SSI (Scuba Schools International) and things started to get better. SSI focused on diving and I got to dive a lot. It was at this shop that I got to do my first 100 dives, earned the rank of Master Diver, went on my first live-aboard in a foreign country, and was introduced to SDI/TDI. I received my SDI Solo Diver certification there which opened up my eyes to the greater world I had yet to explore.
Everyone I met up to this point were all recreational divers and this "technical" arena was interesting. Regrettably, this shop closed as he was really out of the way and I think the general public just didn't want to drive an hour out of town for their scuba needs. The traffic in Vegas was so bad at this point that even this 25 mile trip took over an hour.
Because of my luck with SSI, I found another SSI dive shop and scoped them out for a while. Not only did they love to sell equipment (and take my money), but the instructor was a younger guy like me, in his early 30's and love to dive. He ALSO taught students through "Dive Control Specialist" (Divemaster) AND he taught technical diving.
With the combination of diving, wanting to keep learning, money to burn and a place that was willing to take it, I worked through Advanced Nitrox and Decompression Procedures (my first technical diving courses) and then worked on becoming an instructor. By 2008, I was able to teach and found students on my own here and there. SSI requires their instructors to be associated with a dive shop and they were happy to have me on board.
Being associated with a dive shop wasn't as an employee, rather an opportunity to offer students equipment, education, and a community. The owner of the shop left everything in the hands of his instructor, so our commonalities kept me there for a couple more years.
At this point, Las Vegas had grown to over one million people and was just too big for me. When I first went to Vegas in 1987, it really was a quiet little desert town. I kept the association with that store until it closed and kept my credentials as "inactive" as I knew I had the intention of returning to SSI as some point in the future.
Moving out of Las Vegas, I found myself in Lake Havasu where I spent about a year and a half. The owner of this shop wasn't SSI, and I worked on a cross-over to SDI while I was there. The store owner was the one who continued my technical diving training so I was in good hands and doing what I loved. It was then that I finally got to see the business side of scuba.
Ironically, while I treat scuba as a business today, this was the first time I actually saw what it took to run a successful dive shop. He also did it with an internet presence, an online store, lots of travel to technical dive locations, and ventured into the movie industry support and training for filming that was done underwater. I got to be there and help out on the first project, "Piranha 3D." Yep, that's the one!
My father's health was declining at that point so I made my way to New Mexico to spend time with him during his last year. A little over a year later I was itching for being part of a diving community again so I found Portland, Oregon. I had never thought about the Pacific Northwest, but the cooler weather, cold water, and lower visibility waters was the kind of diving that I was used to.
I had to reactivate my SSI certifications and upon doing so, I was thrust head first into deep water. It's at this point that something seemed contrary to all the training, experiences, and personal insights of my first four years of diving and education. Rather than go into the story and account of what it was like to work full-time in a dive shop and what I liked and disliked about it, I'll present the rest of this commentary as questions to and insight into training, education, certification, and what lead me to being an independent scuba diving instructor only after two years.
Building a business from the ground up, teaching divers to dive, and helping to build a community has been a lot of work, but it has been the greatest undertaking I've ever began and know it will continue forever.
So, lets start in the beginning...
What’s the difference between private instruction and group classes? Let me qualify each first. For the most part, I teach the individual or maybe a couple on their schedule and according to their timeline. The student will expect that I will be with them from beginning to end, but I think the true delineation ends up being that in private instruction, everyone knows each other while in group classes, it is possible that everyone does not.
While one could say that those taking group classes will probably be friendly or amicable and continue their associations with those they learned with, the reality is that a majority of students that finish group classes will never see each other again.
As for what it does for the community, I really think this is a disservice. To this point, even when I incorporate two independent students on an open water weekend that didn't know each other, a large portion end up keeping in touch, becoming good friends and regular dive buddies, but I even have two that became a couple.
The educational process ends up only being the beginning of what the student needs, so I regularly encourage previous students to come to dive excursions, open water weekends, and activities that I bring my students to. This has been particularly easy with social media that I had little to no connection to before going independent.
Very often, private instruction will cost more than group classes. In my experience, private instruction at the dive shop ends up costing the student twice as much. If that instructor is an employee of the dive shop, taking them away from the sales floor can be an inconvenience, so the higher cost is expected.
As an independent instructor, I don't have the overhead that a dive shop does. So in this regard, I can actually charge the rates that most dive shops charge for group classes as I don't have floor space, rental equipment, and employees to pay for. With that said, anyone that thinks I don't have access to everything a dive shop has would be incorrect.
Not only do I have access to everything the dive shop does, but I don't have to store it, maintain it, keep an inventory on hand, maintain a pool, pay for employees, and the like... I've developed relationships with dive shops that appreciate that I bring students there to buy equipment that a student might want (mask, snorkel, boots, and fins), but even equipment that they just need to rent.
With the ability to choose any dive shop, I truly believe that this is a resource that the independent instructor has not been utilized fully in. With cheap equipment available on the internet, the dive shop could be skipped all together. There are even dive destinations that have their own air compressors and teaching only one or two at a time means that I could provide all the equipment and keep the rental fees for myself. There is a reason I don't do this that I'll address below.
Additionally, group classes aren't always less expensive. That's right. I try to teach 3-4 students a month. When I only get one or two, I can offer a discount for a reluctant or perspective student to sign up right now and join my existing class. Not only do they still get great education and individual attention, but they saved a few dollars and I made more than I would have if I hadn't made the offer.
Group classes from dive shops typically will never reduce the price of group classes as their margins are already pretty low if non-existent. A dive shop can't afford to pay the student to learn especially if that student doesn't buy any equipment. Think of the private instructor like the gas station you just pulled into and then notice that the gas station across the street is 25 cents less per gallon.
Are you going to drive over? Perhaps... There are limits that I too can't drop my rates below, but as an independent instructor, being flexible has its rewards. Perhaps I'll make it up on the referral from a friend and the hopes are always that the diver thinks of me when they are ready to continue their diving education.
Developing a relationship with a dive shop has advantages for a new diver as well. If you want to buy equipment, the internet is not always the best deal. Ironically, even after showing students and divers new equipment in a dive shop, many still buy online because they have the expectation that the internet is always less expensive.
For what it's worth, the major manufacturers often set minimum prices that dealers cannot sell equipment below. This minimum advertised prices helps to create a level playing field between all merchants. But in reality, one usually never gets what they paid for when buying online.
If you are replacing a hard to find item that fits you perfectly and you can't find locally, the internet is a viable and practical option. However, the dive shop has a person to help you with sizing, features, benefits, and options. The internet can only give you all the information. While some websites have filters that help to clarify options side by side, if you walked into a dive shop that had hundreds of options, making the best choice for your needs doesn't come easily.
The dive shop employee sells equipment because it keeps the doors open, but most are divers and want you to be in equipment that is best for you, the diving you want to do, works at your current experience level, AND if by chance you have any problems with it, you can get local feedback and assistance with it. While some internet merchants have better customer service than others, you are anonymous and if they lose you, someone will be right behind you to take your place.
One other thing, I strongly discourage anyone from going into a dive shop, trying on equipment, getting that advice and then going online to buy it. The time that was spent on you wasn't free. In fact, it was a service that cost that shop time and money. Their time is just as valuable as yours and while it's included when you buy something, when you go elsewhere just to try to save a couple dollars, that local business struggles to survive.
Additionally, once you have an issue with that equipment you bought online, going into that shop and asking for help rather than contacting the place you bought isn't free either.
There are dive shops out there that will encourage you to buy equipment that is beyond your needs or abilities. No one likes getting the "used car salesman" runaround or feel like they have sucker written across their forehead. Perhaps some of the insights I'll continue to talk about below will help with a continued differentiation between going to a dive shop or not.
Who's going to be your instructor? Interestingly enough, I've had people that want to meet me before signing up. In part, it could be that buyers are worried about turning over money to an individual they don't know, but having a store front doesn't guarantee you won't get ripped off.
All you have to do is check out yelp, google, or trip adviser for reviews and you'll find plenty of brick and mortars that are untrustworthy. Turnover is a consideration as well. When a dive shop is only ran by the owner, it's likely you see them through the educational and certification process. Dive shops with employees are all together a whole another animal. I know of a local dive shop that has had 20 employees over the last 10 years and I'm NOT exaggerating.
Sometimes students will have an instructor that teaches the educational portion, a different that teaches the pool work, and still a third that takes you to open water. It's difficult to build a report with someone you just met. Report is built when you've spent time with that same instructor during the entire process.
One of the most frustrating parts of a dive shop with employees is when you get different answers from different people. While each case is unique, I don't know anyone that doesn't get frustrated when getting more than one answer or different information from within the same business. That definitely breaks down one's confidence in a business that doesn't stay consistent.
I think their are some valid considerations about meeting an instructor before hand, but it is amazing how quickly one's general opinion about someone's commitment can change in an instant. A full-time instructor that has to keep getting up to answer the phone or dealing with new customers walking through the front door is frustrating.
Americans are notoriously impatient. While we know that waiting occurs everywhere and in every business, when we are not the center of attention, it is disconcerting. It does beg the question if that instructor could be as easy distracted with a group of eight in open water. Being able to deal with changing conditions is a trait of a good instructor. Changing conditions in the water is a given. How was it handled? You decide...
Will you get a female or male instructor, can you choose, and does it matter? Teaching styles aside, people learn as differently as differently as people teach. I can only go from my personal educational experiences coming from all male instructors, but there are some personality traits that are unique to men and women.
I have been privileged to dive with women that for all intents and purposes were far better divers than men. One could generalize and say that women are less likely to take risks and men are likely to approach risk but again, that is only a generalization. I've seen women engage in dangerous dive practices as I've also had a women ask me to change the standards for them (skip a particular skill).
I don't change my standard for anyone, even junior divers. Kids do the same program I offer the adults, outside of depth constraints. I can't really help one decide if they should choose a male or female instructor, but definitely try to choose someone with as much experience as you can afford. In any activity with inherent risks, experience should take precedence over gender. If all things are equal, flip a coin.
As of today, there are over 150 different certifying agencies around the world encompassing "cave diving, commercial diving, recreational diving, technical diving and freediving." For the most part, a solid 25 of them that issue certifications on a regular and ongoing basis. Does it matter which certification agency the dive shop or the instructor teach through? That's a tough one to answer.
Anyone certified in a particularly agency is invested in them with time, money, effort, and sometimes a little pain. This COULD matter as the resulting certification will be issued BY that agency. Often, one will only end up seeing differences upon going to another agency. Many say that it's not the agency, it's the instructor that matters, but that is not totally or completely accurate, either.
As an new diver, most take that new certification and focuses on diving to build skills and confidence. Different agency's certifications hold different qualifications, depth limits, skill requirements, and some even require more dives or even re-certification -- yes, it will expire. When it comes to any particular agency, it's important to plan ahead and ask yourself if you think you will continue with additional scuba diving education and training.
Here are some questions to ask:
How deep will the certification be good to?PADI Open Water is 60ft... NAUI, SSI, and SDI is 100ft...Are my skill transferable to another agency?A PADI Open Water diver is not ready for a "Deep Diver" specialty...Are there any skills not taught by this agency?NAUI teaches diver recovery at the Open Water level...Will my certification require certification dives?NAUI requires dives for Nitrox Diver certification...How many certification dives are required?I require 5 dives, the 5th being independent of the instructor, and GUE requires 6. Junior divers often require more. My experience is between 5 and 8 dives to satisfactorily meet my standards, complete all the skills, but everyone is unique...Will I be certified to dive autonomously or only under direct supervision from a dive professional?Almost all agencies issue "Passport Diver" cards that allow the diver to dive with an instructor but not with a dive buddy...Is any equipment required to be purchased?My course require the student to own some things, some shops will rent everything and some shops require purchases as well...What is the transfer process from junior diver to autonomous diver?Every agency is different, some not being skills based -- they just order a new card. In my opinion, skills should be reevaluated and more training provided prior to receiving a new certification...
If the dive shop offers training from various training agencies, what standards are followed? If the student is having problems with skills in one, will they be allowed to change to the other agency to pass? Is the student only getting the minimum standards needed to pass or are they required to go above and beyond the course work?
It is only a matter of time before the necessity for advanced skills are required by the novice diver. Cutting corners only makes the outcomes worse. These questions are important because it is very often the case that the student believes that once they pay, they get certified. Many often believe that once you pay, if you want to quit, you are entitled to a refund since you didn't finish.
Some shouldn't dive. It has to be a given that everyone cannot get the gold medal and there has been a precedence of sports for children giving awards and recognition to everyone that participated. This expectation of entitlement is not only dangerous, but it fails to account for the confidence, competence, motivation and physical ability of the one that wants to go scuba diving.
Ask the instructor if they are affiliated with a dive shop or are independent? Why does this matter? Several reasons, but a major concern is who pays for their professional liability insurance and is the insurance only valid while they are employed or associated?
While many states protect employee's rights, right to work states or contract employees (those that receive a 1099), losing one's professional liability insurance coverage can be devastating in the event of a claim against an instructor. If an instructor is terminated from their position within a dive business, when does their insurance lapse?
What if they are laid off? While insurance is often there to protect the business and instructor, without insurance, a fatality may cause a financial hardship to the diver's family if they were the sole bread winner. While most cases revolve around negligence, many cases settle out of court prior to any finding or conclusion.
What happens if that association is terminated, changes, or if they go out of business? The YMCA used to teach and certify divers but YMCA Scuba no longer exists... Before electronic records were kept, paper records and the subsequent database of associated certifications was the only way to confirm the completion of a program if a diver lost their certification card.
Where does the paperwork go when the business closes? Independent instructors keep their own paperwork until which a length of time has passed and it can be destroyed. Is a business an entity or non-living person be required to do the same?
If that instructor is an employee of a dive shop, ask them if they are on commission or have a sales goal? While commission and sales goals are not a reflection of one's integrity, a negative connotation still exists when one will financially gain above and beyond an hourly wage or salary. I've known people who's limits of integrity changed when it came to paying their bills or putting food on the table.
How many people do you know that put integrity before family or paycheck? Unscrupulous behaviors exist in all professions and everyone deserves to get paid for the work they do. I make it a point to let every student know that I do not work for a dive shop, I am not compensated by them if I bring them customers, and I do not expect favors in any capacity for doing so.
I do tell them that I would love a referral or for them to tell others, friends, and family and that I would love to teach them (and collect payment from them for those services). Nepotism and favoritism within businesses happen. However, big business has a reputation that small business often doesn't. The nuances of business relationships between businesses is complex, but when nefarious practices occur, the customer is often the one that loses.
"Who's the Barber, here?" Will the shop owner ask their instructor to do things, cut corners, or get everyone certified or they'll jump in and do it for them. When this occurs, very often new instructors place employment over common sense but more to the fact, instructors think that there is a hierarchy where skills continue to improve and that past experience is always indicative of future performance or worse yet, outcome. "This is the way I've done it for 30 years," "this is the way it's always been done," and statements like, "it's my way or the highway" only put the student in harms way and only for one reason -- money.
Standards change, equipment changes, technology changes, scientific discoveries emerge, teaching modalities change (online education) and one has to change with the times. That doesn't mean that one can't incorporate the aspects of an earlier time that worked well and modify it to help the student become a better diver.
One thing that I seen in group classes that doesn't occur in private instruction is the fact that, "Nobody ever falls asleep at Starbucks!" Classrooms are not the best place to learn as its has been said that the office is the worst place to work. I once asked a shop owner what to do if a student falls asleep, and his response was, do nothing -- don't wake them up.
I love to teach at Starbucks. Starbucks isn't about coffee, and while they serve it, they serve a brand. One goes to Starbucks to work, commune, take a break, focus, and get things done. Hence, why I tell my students that all of our educational review is done at a Starbucks. The workplace, one's home, and even classrooms are full of distractions that take away from the learning experience.
Because there is a level of background noise already at Starbucks, the student has to focus on the tasks at hand and what they learn. It also gives everyone an opportunity to take a break, get something to eat, go to the bathroom, all without feeling that the education process is being interrupted.
Group classes also have the additional issue of the lack of cohesion. I've seen how students in a group course sit together, fail to interact, follow the instructor around and fail to become part of the diving community. Not only have I seen students that were alone during their training, but they felt alone.
Instruction that is not inclusive means that even though your body is there, your mind is not. With this fact, I prefer private instruction, I keep the diver engaged the whole day in the pool and at open water weekend. I tell students that this time is the only opportunity I have to teach you what you need to know.
I even offer every student the option to just take me with them to all their tropical dive destinations (all expenses paid, of course), where I'll do all the work for them, set up all their gear, show them all the best dives sites and all the cool critters, but to this day, no one has ever taken me up on this offer. It's also why I make it mandatory that we do a deep dive (60ft-100ft, the "deep boats") or that the students go out on their own as a buddy team after the certifications dives are complete.
When the instructor is there, we are a crutch to them. An autonomous certified diver is such because they are ready to dive without the instructor! If any instructor thinks that a diver needs more time or should seek out a dive guide on their trip, they shouldn't award that certification card!
Children are a parent's pride and joy -- most of the them; most of the time! LOL... With that said, why would anyone allow their children to get mediocre training or just the required amount? Does any parent tell their kids to grow up and go out there and just be adequate or average?
While there are other factors that apply here, children deserve the best education possible. They deserve all the attention when in the water, and not because they need attention (most are better divers than their parents) but I have an obligation to bring them back to their parents just as much as I have an obligation to bring their parents back to them!
I don't consider teaching divers how to use this equipment about just checking off boxes on the student's training record. It is because of this that I want students to truly understand the value of what they are buying from me, but what they are getting for their investment.
When you finally get to in-water activities, who is going to help out during the course? Will it be an assistant instructor or Divemaster that teaches you and the instructor will supervise or will you learn from the instructor directly? There are a lot of differences between assistants, helpers, associates, Divemasters, and even how long they've been teaching.
If you are in a group course and it's filled to capacity, what is that capacity that standards allow for? What happens if someone in the group needs help? Who goes to help them or does the instructor have to pass and move to the next student in order to keep everyone moving along?
It is inevitable that differences in ability will occur and does that mean when one in a group has issues, the group then is taught to the lowest common denominator rather than to the highest? When a group consists of family members or people that know each other, it is very likely that taking extra time to get everyone to the same place is not met with frustration or ambivalence. If one with issues within the group needs extra help, will they have to pay for the extra attention or is it included?
When it comes to teaching, I have a personal bias to being an independent instructor, because I am one, but it's not just because that's how I make my money. I've seen first hand that teaching groups in the Pacific Northwest is NOT the same as teaching groups elsewhere.
It's inevitable that if one has to split their time between others, each diver gets less time with the professional. There are some activities that individual attention is not necessary, but in a diver's early experiences in the water, giving them less time is not one of them. Similarly, if you ask other dive professionals if group classes produce the same quality of diver as does private instruction, there can only be one answer -- it doesn't -- and if they say that it is how do they quantify it?
In all fairness, I will teach a full group, 8 students in a classroom, but only up to 4 in the pool at any one time, and I only take 2 divers out in open water at any one time until additional groups of buddy teams skills are sufficient to meet my standards and the needs of that group. Most of the time, it just does not work.
At first, I offer students the opportunity to go out together but when I tell them what is required to make larger dive groups a success, when it doesn't happen, no one has an issue sitting out until we return. The easiest way to decide that more than two divers is practical is if you can see them and how long it takes to get to them if they need help. When visibility can be 1 foot in the Puget Sound, just seeing the person on each side of myself is hard enough; forget about seeing the students on outside of each student next to me... Impossible!
So, if you have the opportunity to talk to each instructor, here are some questions to ask them, personally:
How long has the instructor been diving?Everyone has to start somewhere, but since some agencies allow instructors to enter instructor training with as little as 40 dives, how experienced are they really?How many dives have they logged?It's not just about doing dives, but documenting dives that anyone can see! Diving often and regularly builds confidence through competence!
Where have they done most of their diving?
Those that teach in warm, tropical, and calm waters are not the same as learning in the Puget Sound. The students that come out of each are not the same IF they don't use the skills they learned and bring them to the new dive site...
What other qualifications do they have?Rounded experiences help to teach one to deal with situations that may not occur in an average recreational setting...
There may come a point in time where the student is uncomfortable with what the in the instructor is asking them to do? It's not that they are asking them to do skills outside of the scope of the training they are taking, but one sometimes the student just can't build up the momentum to do the required skill when asked.
Running out of air doesn't slowly present itself and requires one to be ready for it. Being ready to do a skill and performing it, even with difficulty, is different than building up the courage or "psyching" oneself up to do a skill. Inexperienced instructors often fail to require the student to step up to what is required in an autonomous diver.
Sometimes, divers just want to just try it and see if they like it? It is understandable that there are always a group that wants to cross off something on their "bucket list" but when the student has no intention of continuing their training, what is the student's goal for completing the course?
Everyone should push their limits a little bit everyday but limits must be tempered by knowing when too much, too far, and too fast is at hand. If the trained instructor can't see that diving is not right for them, the student definitely won't. Many also learn to scuba dive so they can do it with a partner, spouse, or friends. Those are admirable goals, but very often people push others into areas that they are truly not capable of doing, should be doing, or just don't want to do.
The last thing you need to do is get everything in writing. Make sure you get a copy of the student agreement / instructor agreement and a breakdown of all the fees and charges one can, will be, or is responsible for.
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"How to choose a scuba diving instructor?"
"How to choose a dive shop?"
"What is the difference between private lessons and group lessons?"
"What is the difference between scuba diving agencies?"
"Which scuba diving agency should I choose?"
"Should I go to a dive shop or find a private scuba instructor?"
"Should you trust your scuba diving instructor?"
"Do I need to buy scuba diving equipment?"
"How much should scuba diving lessons cost?"