How deep do dolpins dive?

A bottlenose dolphin can dive to about 330 feet on one breath of air - OPS world champion free-diver Mandy-Rae Cruickshank can to dive to 88 meters or about 289 feet. With a long breath-up Mandy can hold her breath for about 6 ½ minutes, about as long as the maximum a bottlenose can do on a normal dive. Dolphin blood has more hemoglobin, which allows them to store about 10 times more oxygen than their average land mammal counterparts.