That site made me dig into Sea Lions.
Then I read that the Elephant Seal can dive to 1240m, considering that the Elephant Seal can weigh up to 4000kg.How long can a sea lion hold its breath?
Sea lions can remain underwater for an average of 8 to 20 minutes. Unlike dolphins, sea lions exhale before diving. Naturally, their nostrils are closed, but they have special muscles to open them in order to breathe. Sea lions can dive to depths between 450 and 900 feet (135 - 272 m). The reason they can dive so deeply and stay underwater so long is because they have a high tolerance for carbon dioxide. The oxygen in their body concentrates in their heart and central nervous system rather than in non-vital organs. Their relative, the elephant seal, can hold its breath for 62 minutes and dive to depths of 4,100 feet (1240 m).
All I am getting from this is that there is a massive market for cosmetic dentistry.Some very angry looking fish down there.
Or maybe their skulls are just been squashed by been so deep down that they have a constant headache 24/7.
I don't think I wanna go there for Fish & Chips