The sea floor slopes away to more than 40 meters, the maximum recreational diving limit. (DiveAdventuresAsia.com)
Normally, if you follow safe diving limits by using dive tables and / or computers, you are at very very low risk of decompression sickness. (sunrise-divers.com)
Then, in the late 1950s, a genial, charismatic U.S. Navy doctor named George Bond, who had been trained as a diver, caused a stir by questioning the conventional diving limits. (discovermagazine.com)