http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Medicine/oddsnends.htm
My useful limit under water
is about fifty seconds; a goggler-fishing desciple of mine can stay two minutes, which I
thought extraordinary until I heard of a Red Sea pearl diver's record of six minutes. This
time seems incredible, but I have it on good authority...