Our vacation in paradise offers a deep diving towards the signature attraction, a wreck at 110 ft and beyond. You’ve never been that deep ahead of. Must you attempt the diving?
The risks of DCS, running low on fresh air and nitrogen narcosis raise as you go deeper, but these risks are manageable with training, the perfect gear, experience and this five-step plan.
1. Decide If You’re Prepared
Photo by Chris Jaffe
To decide if you are prepared for that diving, contemplate:
Your diving experience. How numerous dives have you made because your open-water certification? Starting divers are advised to stay above 60 ft, in big part to give them time to internalize skills and procedures at a comfy depth. Grow to be totally comfy with shallow diving before you go deeper.
Your deepest previous diving. How deep have you already been, how generally have you been deep and how recently? It’s finest to raise your depths gradually. Get in a handful of dives to 80 feet or below prior to you try 110. They must be dives within the last year, since learning degrades above time.
And how did you sense the last time you went deep? Getting back about the horse that threw you might or may perhaps not be the way to learn to ride, but when you were scared witless at Ȱ ft do not anticipate to cure your self by heading to 110.
Your tools. Certainly, you’ll need to be properly equipped and your gear has to be in excellent condition. Not so clearly, none within your equipment should be brand-new on that deep dive. So that you can stay calm and able to handle the unexpected, you must maintain your “task loading” to a minimum. At degree with a 110-foot dive is no place to forget which could be the inflate button on your new BC. Or to discover that your new mask fogs. You need to think confident with your gear just before you go deep.
Your buddy’s encounter and products. The least-prepared friend need to determine the limits in the dive. Resist the temptation to exceed your buddy’s comfort level (“Relax. You will be fine!”) or your personal (“I guess he knows what we’re doing”).
When you are nervous about a dive, pride plus the fear of admitting fear can make it hard to face the truth.
The conditions of the diving. In several ways, “deep” is relative. A 110-foot diving in warm, clear, calm Caribbean water is almost certainly not as challenging as a 70-foot diving with a cold, current-swept New Jersey wreck. What counts is the total stress level. Level is one particular stressâ€others are cold, existing, reduced visibility, surge, apparatus load, anxiety, fatigue and a lot more.
Surface support. Is somebody staying using the boat to ensure it stays anchored, and to render assist if it’s required? Is there oxygen on board? A radio? Will an ascent/descent line be deployed? A hang bar? Is often a recompression chamber reachable within a few several hours? Do the divemaster, the boat captain along with the diving operation inspire confidence?
Your motivation. Finally, ask on your own why you might be considering this dive at all. Due to the fact you need to see the wreck is really a valid cause. Simply because you need to produce a moderate and prudent expansion of one’s deep diving experience to aid prepare you for that dream trip to Truk is valid too. “Because everybody else is carrying out it and I will not desire to search like a wimp” is not.
2. Prepare By yourself
In the event you and your friend decide to make the deep diving, use the dives between now and then to prepare:
Fine-tune your weighting. You desire the minimum fat that lets you hang at 15 ft over a nearly empty tank. Any excess fat requires more fresh air inside your BC. The excess oxygen compresses, so your buoyancy fluctuates additional with degree and is going to be additional difficult to command.
Compare air consumption. Who ends a diving with far more oxygen, you or your buddy? Program the deep diving according for the needs with the “air hog.”
Sort out gear difficulties. The shallower dives are a chance to make sure your equipment is working proper and is adjusted properly.
3. The Diving Day
Be rested. Prepare on an early night previous to the morning of your diving. Fatigue predisposes you to DCS, nitrogen narcosis andâprobably a lot more importantâcarelessness.
Be hydrated. Dehydration also raises the DCS risk, and leads to fatigue sooner. Limit your intake of alcohol and caffeine beginning the night just before, due to the fact both cause dehydration for quite a few hours afterward. And drink lots of waterâabout two additional quarts per day.
Be “green.” That is certainly, be properly into the green zone of your respective computer system. It really is ideal to make the deep diving the very first from the day, so you have the benefit of a full night of off-gassing. “Deepest diving first” is no longer considered an absolute rule due to the fact a dive laptop or computer can track your nitrogen loading fairly accurately, but it is even now a wise practice. Any with the green zone you use up in an earlier dive reduces your readily available time around the deep diving.
Program the diving. That is the time for a a lot more complete, a lot more formal diving strategy than seemed necessary on shallower dives. Bear in mind to approach with the boundaries with the least-capable friend.
As important as time, depth and route decisions is the opportunity dive considering gives you and your buddy to look at how you the two sense. If either has any doubts, the two of you need to abandon the deep dive.
Produce a buddy verify. If you’ll ever trap a hose under a BC strap it will be now, when you’re a bit nervous. And make sure that each of you locates, and knows how to use, the other’s alternate oxygen source, BC inflator and bodyweight release.
Create a final go/no go decision. Seem every single other in the eye: does this even now sense good? In fact, this just isn’t a final decision. Either buddy can abort the dive for the two at any point, and shouldn’t hesitate to perform so for any motive.
4. In the Drinking water
Observe your buoyancy. Your buoyancy will fluctuate far more with higher depth since the ticket as part of your BC and also the bubbles as part of your wetsuit compress. Your descent pace can accelerate so very much that it may be difficult to cease at your planned degree. It is possible to then waste considerable oxygen inflating and venting your BC as you search for neutral buoyancy.
Check out your inhaling and exhaling pace. Slow, deep, relaxed inhaling and exhaling is in particular crucial during a deep diving because the fresh air you’re inhaling and exhaling is much denser. As the air stream turns corners and passes restrictions in its journey from your tank to your lungs, friction causes turbulence, which restricts the oxygen flow and increases your breathing effort. Denser oxygen and fast-moving ticket the two increase the amount of turbulence. So since the fresh air becomes denser with depth, it’s important to keep the speed on the fresh air stream downâto breathe slowly. Likewise, it is possible to very easily shed manage of your ascent price from depth unless you view your rate carefully and vent your BC constantly.
Denser air also signifies more molecules with the stuff that your regulator has to procedure with every single breath. Rapid breathing can exceed the flow charge of even a excellent, well-maintained regulator, increasing your work of inhaling and exhaling.
Shallow breaths, which tend to become rapid ones, lead to a build-up of carbon dioxide as part of your system. That’s because the CO2-rich “dead air” space with your throat, mouth and second stage is diluted less by incoming fresh air. High carbon dioxide concentrations, which can also be caused by higher operate of breathing, trigger the impulse to breathe quicker and shallower. Now you’re in a “vicious cycle”: inhaling and exhaling more challenging mainly because you’re inhaling and exhaling more challenging, and obtaining much less and less fresh air.
Finally, shallow, quick breathing is an early sign of nervousness. When inhaling and exhaling also becomes more challenging, anxiety can grow to be panic.
What to complete? Quit finning and hold on to something like a mooring line if you are able to. Take a slow, deep breath, wanting to entirely fill your lungs. Then exhale slowly trying to totally empty your lungs. Do it again, until you relax.
Watch your gauges. All the readouts for level, air stress and bottom time change more speedily at depth. At the exact same time, the margin for error is smaller and the consequences are far more significant. Verify your gauges far more typically than you’re accustomed to on shallower dives.
Enjoy your buddy. Investigate your buddy far more frequently than you normally do. Some buddies agree to make eye contact every three to five breaths, for instance. Appear for signs of nervousness, like rapid inhaling and exhaling, jerky movements plus a “wide-eyed” seem. Is your OK sign returned swiftly and calmly? Verify your buddy’s gauges from time to time, and expect your buddy to verify yours.
Diving the approach. Stick to the diving strategy you’ve agreed to, specifically the maximum depth and bottom time, plus the time or air stress for starting your ascent.
One exception: by no means be reluctant to begin your ascent earlier than you had planned, whether due to the fact you’ve utilised fresh air more rapidly than you expected or due to the fact either of you feels uneasy.
Ascend early and gradually. The greatest danger in a deep diving is almost certainly from the ascent. Due to the fact your buoyancy changes far more than you’re used to, it’s effortless to lose handle of your ascent fee and blow through your safety quit. Since you use fresh air so rapidly at degree, when you do not view your gauges closely it is easy to run low and need to make a dangerously rapid ascent.
To command your ascent price, produce a significant effort to locate and use the ascent line, or an anchor or mooring line, or a stand of kelp. Start venting your BC early. Tend not to use the lift within your BC to ascend; instead, stay neutral or even slightly negative and fin to ascend.
Beginning your ascent with sufficient fresh air signifies preparing quite conservatively. Some divers follow the rule of thirds, utilizing the initial third of their air supply to the descent and bottom exploration as well as the second third for the ascent, retaining the final third for reserve. That would mean beginning your ascent when a 3,000 psi tank reaches 2,000 psi.
Yet another rule of thumb is always to approach on 100 psi for each and every 10 ft of ascent. Adding a 500 psi reserve, that would mean beginning your ascent from 110 feet at 1,600 psi (1Ǡ x 11 500 = 1,600).
How conservatively you strategy will depend in your (and your buddy’s) practical knowledge and inhaling and exhaling charge.
If you have some doubt whether or not you’ve ample oxygen to maintain a 30-foot-per-minute ascent fee from the bottom, produce a more rapidly ascent at primary (say, 60 feet per minute), then slow down to 30 feet per minute at 60 feet. Even in case you reach 15 ft with much less than the normal 500 psi reserve, use it there for a basic safety quit.
Keep in mind that all dives, and particularly those to below಼ feet, are in fact decompression dives. A slow ascent price and also a safety cease at 15 ft serve the similar purpose as planned decompression stops. Tend not to omit them.
5. Immediately after the Diving
Rest. Though you’ve not violated no-decompression limits, you could have taken with a significant nitrogen load, and DCS is possible. Avoid exertion for no less than an hour and drink plenty of drinking water. Moist tissues exchange gas much more rapidly, and a well-hydrated blood supply is thinner so it circulates additional speedily.
Will not fly instantly. The existing Divers Alert Network advice is usually to wait 12 hours after a single no-decompression diving and “more than 12″ following a planned decompression diving, or numerous dives, or multiple days of diving. Superior put a deep diving inside latter category.
How a great deal “more than 12?” Simply because a deep diving may perhaps be pushing the no-decompression limits, it can be safest to wait a minimum of 24 hours. And it probably helps to produce your deep diving near mid-week, when you’re recovered from jet-lag, as much as speed with your gear and even now have several days to off-gas nitrogen.
Preparing a Deep Dive
Formal diving setting up is additional critical when the stresses are higher as well as the margin for error is smaller. The preparing process is also a time to gauge your buddy’s anxiousness levelâand your personal. The elements:
Objective and route.
Time, level, air boundaries. Specially important when no-decompression bottom time may be only a few minutes. And determine on a time or oxygen stress for beginning your ascent.
Conditions. Are you the two comfy with the planned degree, the vis, the existing, the cold?
Products. Where is your buddy’s BC inflator, alternate ticket, weight release, and so on.? Are you both rigged correctly?
Communications. Have you agreed around the very same hand signals?
Lost buddy procedure. What will you do should you are separated?
Emergency expertise. Review what to accomplish in the event of reduced air, entanglement, and so on.
Gearing Up for Heading Down
Equipping on your own for deeper diving implies having the proper gear and maintaining it.
1. High-performance regulator. Delivering enough air to two divers at depth from a minimal tank demands a high-performance reg. Consult Rodale’s ScubaLab tests to the latest efficiency reviews. Regular maintenance of your regulator may possibly be as crucial as its initial design. Regulator flow characteristics degrade around time, even when just sitting as part of your gear bag. Have your reg overhauled regularly.
2. Alternate oxygen source. In the event you run out of ticket at depth you will be glad your buddy’s octopus is usually a high-performance regulator. It is, isn’t it? In reality, your buddy is most likely low on fresh air as well, and his octopus won’t do you a great deal good. That’s why quite a few deep divers use a totally redundant ticket sourceâa pony bottle and regulator or Spare Ticket.
3. Compass. Navigation is a lot more important at depth due to the fact you can’t realistically pop towards the surface to orient on your own. And finding the ascent line will make it much simpler to handle your ascent pace.
4. Dive computer. In case you will not have one yet, now’s the time. A diving computer is far additional capable than a table at predicting your nitrogen loading more than several multilevel dives, and that is specially essential when you may perhaps be pushing the no-decompression boundaries.
5. Submersible stress gauge. Of course you might have 1, but how accurate is it? Far better have it checked.
6. Surface signaling devices. For those who have to create a free-swimming ascent from level when present is running, you may well surface far from the dive boat. An auditory signal (like a Diving Alert horn) including a visual 1 (like a basic safety sausage) will make your day.
7. Exposure protection. You’ll likely will need additional at higher depths. One particular explanation is that you may perhaps pass by way of a thermocline and enter a great deal colder h2o. Another is that neoprene compresses as you go deeper. At 110 feet, your wetsuit loses far more than three-fourths of its insulating value.
Nitrogen Narcosis
Q: What is it?
A: An impairment within your thinking processes triggered by breathing nitrogen under stress. The likelihood increases with degree. U.S. Navy tests showed all subjects had some narcosis at 100 feet.
Q: What are the signs?
A: Most typically, a false sense of security and inappropriate euphoria. Even though in case you begin the dive anxious, narcosis might take the form of paranoia. It seems to magnify your latest emotional state, whatever that’s. The tricky part is recognizing when your sense of security is false or when your fear is justified.
Q: What can you do about it?
A: Remain focused. At recreational depths narcosis is typically mild. You possibly can typically overcome it by concentrating on your diving strategy, your instrument checks, your friend checks, and so on.
Ascend. Typically, heading up only 10 feet will alleviate the symptoms almost quickly. Then, you are able to generally return towards original degree without symptoms.
Be warm and rested. Breathe gradually. Fatigue, cold and substantial carbon dioxide levels promote nitrogen narcosis.
Be clean. Numerous drugs, including favorites like Sudafed, Dramamine and Scopolamine, interact with nitrogen and accelerate its effect.
Get accustomed to it. Divers seem to be capable to develop a tolerance for nitrogen narcosis with deep diving experience. Working as much as your planned depth will reduce narcosis difficulties, although the adaptation fades inside a week or so.
