Can you survive 47 m.underwater?
If you are trained and follow the protocols you may dive up to 47 meters or even deeper. Any depth has dangers. Recreational divers are qualified and trained to dive up to 18 m. that is 60 feet. The human urge to check how deep you can dive can make people push beyond their limits.
Deeper dives are considered technical diving and need additional training and certification and should be done with prescribed and certified gears like best Prescription scuba mask etc. Dives below 60 m. that is 200 feet should be done with special gas breathing mixtures to limit nitrogen narcosis and oxygen toxicity.
If you want to know about diving to and beyond the depth of 47 meters it’s barely exceeding recreational depths. Many divers go deeper than that regularly. It requires more preparation than a dive to say 20 m.
But there is no magic about 47m. You have a minute or two at that depth before you require to use a decompression plan to surface safely. The longer you stay at depth, the more time it will take you to surface without getting bent.
With enough air tanks, a person could survive 47 underwater. The longer you stay, the more is absorbed into the blood and when you return back to the surface, you may have to decompress for hours underwater so the air in your system can get a chance to leave, so you won’t get the bends. Recommended read: can you die from the bends?
With preparations taken care of. Proper equipment setup ready to go. Safety procedures and protocols in place. Video equipment filming every second of this type.
Not only could you survive but you could have the making of a great short film for whatever your project is supposed to be.
On Scuba Diving, it’s a bit deeper than recreational diving, which is slightly into decompression territory. Many technical and professional divers still do this routinely, as do some free divers.
The Risk Associated With Scuba Diving To 47m And Deeper
As long as you follow the rules and procedures deep diving is safe but there are risks associated with diving 247 meters or actually diving below 30 meters.
The first risk with diving to 47 meters is running out of air. The deeper you go underwater, the water pressure becomes greater. With increased pressure, the air gets compressed. This is Boyle’s law – the deeper you go the more your air will get compressed.
The air sacs that are the lungs are required to be filled when you breathe in, so air is required at the depth. As a result, as you descend, you need to breathe more air so you will go through your 200 bar air tank more quickly at 47 meters than at 10 meters or less. So the deeper you dive, you get less time to dive with the same amount of air in your dive tank.
How To Minimize This Risk?
Make sure you check the air contents gauge regularly. As your air is consumed more quickly at depth, you are suggested to keep a more focused check on it. Also, you must make sure you have enough where to get you back to the surface. This requires more air from a depth of 47m. then it would be from 30 meters. You also need to take account of decompression stops where relevant.
The second risk of diving to 47 meters is nitrogen narcosis. The risk of Nitrogen narcosis increases the deeper you dive below 30 m.
At sea level and on land you are subject to one atmosphere of pressure or atmospheric pressure (1 bar). This amounts to a weight of 10000 kilograms per meter square or 14.7 Pounds per square inch.
Seawater Is 800 Times Denser Than Air.
Seawater is 800 times denser than air at sea level. Water pressure increases by one atmosphere for every 10 meters of descent below the surface.
For example, at 10 meters the pressure is now two-bar or two atmospheres. If you dive to 47m. the pressure would now be at 6 bar or 6 atmospheres. This is six times the pressure of what is pushing down on you. This means that the concentration of Nitrogen at depth is higher than at the surface.
At 47 m. it is roughly 6 times the concentration. Nitrogen represents 79% of air, if nitrogen is breathed at atmospheric pressure it has no effect on us as it is an inert gas. As you go deeper this changes and nitrogen becomes intoxicating.
The effects of this are similar to nitrous oxide inhalation. This leads from Euphoria to drunkenness to confusion and unconsciousness. In some Scuba divers, dysphoria and Paranoia occurs. This leads to panic with some Scuba divers.
How To Minimize The Risk Of Nitrogen Narcosis?
The simplest way to avoid nitrogen narcosis to limit your Scuba Diving to not more than thirty. That is not to say that you can’t or should not dive deeper. The second way to minimize this risk is to build up your dives.
Don’t dive straight to 47m or whatever depth it is. By slowly building up the depth of the dive during a season, you build up a resistance to the effects of Nitrogen on your body. This is not a guarantee.
Use nitrox, which has a high percentage of oxygen in your air. With a 32% mix of oxygen, you are limited to 37 m. You need to take more training for diving using nitrox. You can also begin to use mixed gas.
Mixed gas at depth changes the composition of the air which you breathe. This is more technical diving. The technical divers say- using trimix gas at 47m. is a waste because it is expensive.
The risk of decompression sickness is the next risk associated with diving deeper. Decompression sickness is caused by a Scuba diver coming up too fast from a dive. It is a result of the dissolved nitrogen being released too quickly from your body tissue on ascent.
The released nitrogen forms bubbles and these bubbles can cause major problems. The problem can be as minimal as a skin rash or a skin bend, to the extreme of a fatality. The deeper you go, the faster and more nitrogen dissolves in your body.
Once this dissolved nitrogen amount goes past a certain limit in your tissues, you need to incorporate 1 decompression stop into your accent at least. If you want to Limit your dive to a no decompression stop dive, you have to limit your bottom time accordingly.
For example at 47m. if you are diving on the BSAC table A, you have a total of nine minutes no decompression stop time at this depth.
If You Exceed No Stop Bottom Time, You Are Into Decompression Stops On Your Ascent.
If you exceed the no stop dive time, you fall into a decompression stop time. It means that you also need to incorporate certain decompression stops in addition to your ascent from your dive decompression time.
For example, if your dive time went to 28 minutes at 47 meters this involves two decompression stops. One at 9 m. for 3 minutes and a second decompression stop at 6 meters for 18 minutes.
You not only need enough air to complete your bottom time of 28 minutes you also need enough to get to both decompression stops and to carry out the stops.
On top of that, you are also required to arrive at the surface with your reserved air which is accepted as 50 bar. The risk is decompression sickness due to not decompressing properly on your return to the surface. The risk is increased due to how quickly decompression time sets in at these deeper depths.
How To Minimize The Risk Of Decompression Sickness?
The easy way to avoid decompression sickness is to follow the correct rules of ascent in Scuba Diving. You should not ascend too quickly for a start but must carry out the decompression stops wherever necessary. To reduce the risk you are to dive only no stop decompression dive. This limits the amount of your time on the bottom.
There is not much you can do or see on a wreck in 9 minutes. This is true if it is a large wreck. Final word of advice is never do scuba diving without certification and always do it under supervision.