In seventh grade I went to the national scout jamboree and 10 minutes in a 4 ft deep pool was enough to get me hooked. The summer before going to college, my aunt took a grad class trip to Hawaii. The prof wrote an undergrad version for me. Scuba was on the itinerary, so I got certified...
I'd test the air before diving it. If there was any moisture in the tank, it could have rust in it which would have eaten up the oxygen. Just test it as you would for nitrox.
If someone did have an unfortunate shark encounter given your new set of rules (diving with no cage in chummed waters with great whites and cage divers around), I would not blame the shark for testing things in the water to see if they are in fact food. I would blame the person for setting up...
No, I would not jump in behind a boat of cage divers. However, this does not prove your point. This violates your original assumptions of no shark feeding occurring. The water has been chummed for the cage divers and the sharks are coming hungry and looking for food. This is not typical...
Last I checked, there is not an ocean teeming with man-eating sharks. Also - even lethal shark encounter (not attack) victim's families have joined in the protest AGAINST culling.
Divers rarely have problems with sharks. Most shark encounters happen with swimmers/surfers who are on the surface and look like prey from below. I don't think a fatal shark encounter would have any affect on where I dive.
The last time I dove Hawaii was April 2008.. the shop that I went with only had shortys available to rent. I ended up wearing at least 2 and still froze during the dives. The dive guide I was with had a 5mm full suit and a hood. Now that I have a couple wetsuits of my own, I'd probably go...
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