Quote Originally Posted by oskar View Post
Another famous example would be the japanese ama divers. Humans are surprisingly good underwater. 4 min. should be attainable for most people - just staying underwater, not exerting yourself ldo. There are reports about apnoe divers "slowing down their heartbeat" and they make it sound like a superhuman power. Everyone's heartbeat slows down once you go underwater for more than a couple of seconds. I'm sure you can train to stay more relaxed, but it's nothing magical.
Do you suppose your eyes would become adapted like theirs if you were adopted by these people at birth?