system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If the brain can’t go longer than 6 minutes without oxygen before brain damage occurs, how can some free divers hold their breath for 10, 15 and even 20 minutes without getting severe brain damage?
gpt
It is the blood that carries oxygen. Divers have their oxygen level highest possible before the dive. Extra breathes minutes before the action can help. Also there is no proof some of them havent got brain damage.