This dive was more difficult than most ... between his thumb and forefinger to equalize instead of relying on a nose clip. Plus, cold water makes equalization of the sinuses, when a diver funnels ...

Alessia Zecchini is getting ready to dive. Nose pegged firmly shut, she sucks in a few final breaths of air through pursed lips as the countdown begins. On zero, she flips over and powers down ...