Dive Training Blogs

Be Aware of Failure Points

Published

5 years ago

March 6, 2019

The final in a series of three excerpts from Simon’s new book: Scuba Exceptional…

Ian back-rolled into the water and dropped down fast to 20m, at which point he reached for his inflator to inject some air into his BCD to halt his descent. However, when he pressed the inflator button, all he did was inject a stream of air directly into the ocean. He looked down and, to his surprise, saw that his inflator mechanism was connected only to the low-pressure inflator hose. His corrugated BCD hose was nowhere to be seen.

He continued to drop. He tried finning up to arrest his descent but this just slowed him down. He was still descending with no means of correcting his negative buoyancy. He was using a wing and harness BCD with a 7kg stainless steel backplate and had no free weights to ditch. Luckily, his diving companions were close by and came to his assistance. They got him back to the surface, so he lived to dive another day.

Ian had come up with the idea of wearing a heavy backplate with his BCD because he didn’t like wearing a weightbelt or weight pockets. He always worried that a belt might slip over his belly and fall off, causing him to shoot to the surface. And weight pockets always made his legs drop, giving him a seahorse-like posture.

Ian had never considered that his BCD might fail during a dive. All BCDs have multiple failure points. The wing can tear, dump valves can shear off and inflators can fail in multiple ways. Every diver should always make sure they can reach the surface and stay afloat once they get there without the assistance of their BCD. This is usually achieved by dropping some or all of their weights. All Ian’s weight was in his backplate. There was nothing he could do to make himself positively buoyant, except remove his equipment entirely, which, at depth, might have been disastrous.

The problem that had caused Ian’s BCD to fail on this occasion was that his corrugated hose was only connected to the BCD pump mechanism by a single cable tie and this cable tie had broken and come off. Cable ties are notorious failure points, which is why all good BCD systems have TWO cable ties or a permanent heavy-duty screw fitting at each end of the corrugated hose.

Good BCDs also have some sort of permanently fixed bridging or wrapping device connecting the corrugated and inflator hoses. This device is there so that if the corrugated hose comes off the pump, it will stay in place next to the inflator hose. The diver can then reattach it to the pump and hold it in place manually while they inflate the BCD. Ian’s BCD had no such connector, so his corrugated hose just floated off behind his back. He might have been able to reach it but he was so bewildered, he didn’t even think of that.

Be aware of the potential failure points in every item of your equipment and make sure you know what to do to survive when a failure point fails.

This piece is adapted from a chapter in Simon Pridmore’s new book Scuba Exceptional – Become the Best Diver You Can Be available now from Amazon, iTunes, Kobo and other online bookstores.

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Simon Pridmore

Simon Pridmore is the author of scuba diving books, travel books and, as you might expect, scuba diving travel books. Originally from the UK, Simon has lived in Asia for over 30 years. As well as his books and guides, Simon writes regular columns for a number of magazines. He and his wife Sofie currently live in Bali, Indonesia but spend a lot of time exploring other places trying (but failing so far) to find a cure for their itchy feet. Simon's latest book - Scuba Exceptional – Become the Best Diver You Can Be - the follow-up to his best-selling Scuba Confidential, is available now in paperback and e-book versions from Amazon stores worldwide. Find out more about Simon and his books on www.simonpridmore.com

Blogs

Intro to Tech: What is it about?

Published

3 weeks ago

April 7, 2024

International Training

Article by José Pablo Mir
Pictures by Cezary Abramowski

The world of technical diving is exciting. It opens the door to new sites, depths, and bottom times. More importantly, it opens our minds to a new way of planning, facing, and experiencing dives, even those not purely technical.

Becoming a technical diver is a process, and like in other aspects of life, we should find the proper entry point that suits us best based on our knowledge and experience. The Introduction to Technical Diving course from TDI -the world’s largest and most recognized technical diving teaching organization- is the best option for divers who have yet to gain experience in the fundamental aspects of this new practice. The course’s content and its embrace of new techniques and technologies make it possible to acquire a solid foundation to learn and gain experience in this practice properly.

Becoming a technical diver is not something that happens overnight, whether deciding to become one or receiving a certification card stating we are now technical divers. It is a slow process extending farther away than any introductory course. It requires effort and dedication. But it will bring us satisfaction from day one -or two.

It is a matter of mentality

First, we must understand and accept that technical diving, involving greater depths, longer bottom times, exotic gases, virtual or real ceilings, and more, comes with higher levels of risk than the sport diving we have been practicing until now.

Although this discussion usually starts with a warning about risks, as I’ve done in the previous sentence, our practice is not a game of chance.

Technical diving is a rational activity that requires maturity and good judgment, and we will put everything into ensuring that each dive is a successful one -meaning we return from it safe and sound. With this understanding, we will strive to establish a mental attitude more aligned with our practice and its realities.

This new “technical diver” mindset we will develop will lead us to be more cautious in our executions, more analytical in our plans, more rational in our strategies, and more detailed in our procedures.

Experience will keep teaching us to know ourselves better, to keep our anxiety and other emotions under control, and to manage our impulses. Over time, our senses will sharpen, and we will be more attentive to the particulars of the situation we find ourselves in.

tech diving

Strategies and procedures

Our strategies, those broad guiding lines tracing the path to follow, from how to approach planning to where, with what, and how we are willing to get there, will be more specific and more practical. Not because they magically become so, but because we will consciously and deliberately frame them that way.

We will establish clear, concise, and realistic procedures. Not only for the undesirable situations that may present themselves but also for those that are part of our dive objectives.

Even though, as technical divers, we often use equipment different from what we were previously accustomed to, it is essential to note that the gear does not make the diver. In a way, we could consider such equipment as the necessary tools to implement what our goal seeks to achieve, according to our strategies and procedures.

Technique plays an important role

We must put our greatest effort into learning and perfecting the different techniques we will be acquiring. Buoyancy, trim, propulsion, cylinder handling, deploying DSMBs and lift bags, valve drills, and more are essential skills we must begin to master to progress in our art. What we cannot do, when we need to do it, can harm us.

Our techniques must be effective and achieve the purpose for which they were devised. But they must also be efficient and require the least resources possible, including the time they take and the effort they demand. Effectiveness and efficiency will prevail over beauty and other considerations that may come to mind, although none of them should be mutually exclusive. A technique executed efficiently and effectively tends to have an inherent beauty.

Refining techniques is a lifelong mission. Some of them will be easy to master from the go; others, on the other hand, will be our life mission and will require many repetitions just to resemble the idea we have in mind of how they should be executed.

We must consider the environment

Our learning, the needs and musts of the practice we engage in, the experience we gradually gain, our strategies and procedures, and even our equipment and tools change with the environment.

Diving in the ocean, everything about us must be suitable for ocean dives. Conditions there rarely emulate those found in a pool, lake, or river. Variable winds and currents, greater depths, visibility conditions, other divers with uncertain skills around us, marine life, maritime traffic, distance from the coast, and many other factors add complexity and uncertainty.

It is never necessary to master the pool on the first day, but planning and aspiring to gradually cope with the ocean’s conditions is essential.

The cost of good training

We are aware that our resources are often scarce in relation to the possibilities of use we could give them if they were not. To a greater or lesser extent, we are part of the economic reality in which we are embedded.

Fortunately, the cost of good technical diver training is not an entry barrier. Comparing training and equipment costs, we see that the former are generally lower. Yes, lower cost for personalized service, essential to our future

performance and safety, than for a series of mass-produced products that are mere, albeit necessary, tools for an end.

The value of good training

The value of the training we received encompasses a range of characteristics, from emotional and methodological to technical and technological. TDI and its Introduction to Technical Diving course offer a deep and modern approach, with a teaching strategy that aims to create thinking divers, not merely obedient ones.

As technical divers, our knowledge is our primary tool. In this type of activity, what we don’t know can harm us.

Is this course optional?

Unfortunately, the fact that this Introduction to Technical Diving course is not a prerequisite for any subsequent training is an invitation to consider it optional. And we all know what usually happens to “optional” under budget constraints.

However, this course should be seen as optional only by those divers who are somehow familiar with the use of technical equipment, who have a mindset more in line with the requirements of this type of diving, who plan and execute the dives the proper “technical” way, who know their gas consumption rate, who are not intimidated by non-decompression tables, who feel comfortable using their dive computers, and know the techniques and have at least an acceptable level of buoyancy, positioning, and propulsion. Those can go straight to a more advanced training course, such as TDI’s Advanced Nitrox.

We must ask ourselves whether or not we are in that group.

Remember our goal: to have fun

Recreational diving is our passion. Jumping into the water carrying heavy equipment and having properly dotted our I’s and crossed our T’s have only one ultimate goal: fun. This is the activity we have chosen as a hobby. We must enjoy it; it must give us pleasure and make us vibrate.

Having a good time is not optional!