This is from a poster that was created by the famous Cave Explorer Sheck Exley;
Before the Dive, What if…;
- The gas company put the wrong gas in the cylinders you fill from?
- The wrong grade of helium is in them?
- THere are impurities in the gas?
- You miscalculate your mixtures and have too much oxygen?
- Too little oxygen?
- Too much Nitrogen?
- Too much Helium?
- The for mixing is wrong?
- The filling temperatures are different?
- The dive shop filling your tanks allows the gas to bleed back into their bank system?
- Your cylinders contain flammable materials and you put in pure oxygen?
- The dive shop tops your deep tanks with bad air?
- A pinhole leak allows the helium to leak but other gases remain?
- Your get the cylinders mixed up while filling?
One the Descent, What if…;
- You do not have enough oxygen when you submerge?
- Your depth gauge reads shallow?
- A tank you thought had trimix was really nitrox, etc?
- You over breath your regulator?
- You have a delay before ascending?
- You have a delay on the way down?
- You have to exert a lot on the bottom?
- You have a five minute line entanglement etc, on the bottom?
- You lose your dive partner on the bottom?
- You get blown from the dive site?
- You lose your mask?
During Decompression, What if…;
- The decompression tables you have don’t work?
- You lose your decompression tables?
- You lose your watch?
- You lose your depth gauge?
- You run out of decompression gas?
- You drop one of your decompression cylinders?
- Some steals on of your decompression cylinders?
- Your decompression cylinders have leaked?
- You are delayed at a decompression stop?
- Danger from hazardous marine life keeps you from completing your decompression?
- Your drysuit floods?
- You get hypothermia?
- You get the bends
These are all the situations one should think of when Technical Diving…and be sure you can accept the risks!! Otherwise do not do it!!