> Free divers who can go deeper Makes me wonder if free divers could possibly already cheat by swallowing air, perhaps even pure O2, before dives, to slightly

> Free divers who can go deeper Makes me wonder if free divers could possibly already cheat by swallowing air, perhaps even pure O2, before dives, to slightly increase maximum time submerged through gut gas exchange. Althought this probably would mess with buyoancy a bit.