Sea otters eat 25 percent of their body weight in food every day. Sea otters’ diets include sea urchins, crabs, mussels, and clams, which they’re known to crack open with a rock and eat while floating in the water.
Got me curious as to what a human could survive. The record is 702 feet, but he was a professional, and he actually did an even deeper dive, 831 feet, but sustained brain damage on the way back up. This is freediving with no breathing apparatus. Most people can only go a maximum of about 60 feet or less.
I might be off here, but iirc, eater is about 1000 times denser than air, so 10 meters of water gives you the same pressure as the 10 kilometers of air above you. It goes fast.