How long can one humanly live under ater with no help?

Question

ie no oxygen

Answer 1

2-3 min. dont try it! lol

Answer 2

The French guy trying to jump out of a high altitude balloon recently over Canada has been recorded to hold his breath under water for over 6 minutes.

There are pearl divers in Asia that can consistantly hold their breath for 5 minutes.

Answer 3

Special breathing techniques used by trained people under medical supervision can achieve surprisingly long times; fifteen minutes and more.  It involves being very relaxed, not moving unnecessarily and breathing out extremely sparingly.  I've no idea what the present world record is.  This is presently pursued as a kind of odd sport.