There were numerous threads re: death of David Torrence months ago. Wasn't free-diving mentioned months ago? In theory, holding one's breath under water for longer and longer duration causes more and more oxygen to be stored in one's spleen. Under controlled circumstances, the human record is a bit over 20 minutes. It's common for whales to go 45 minutes or more sans fresh air. In theory, when one goes anaerobic the stored oxygen in spleen may help an athlete. I can't image David Torrence was vigorously swimming laps in a pool at the apartment complex. An apartment complex normally will have a pool no bigger than 15 yards in length. Who want's to swim a mile in a 15 yard pool? Is it possible Torrence didn't know his limitation regarding free-diving?
He had a beer, it was (August in Scottsdale, is hot AFand it gets well above 110degrees during the day and at night it's not much cooler. Torrence decided on a late night dip in the pool. He dives in for a few minutes, cardiac event occurs perhaps, loses consciousness. If he was on the pool deck, he lives but if your unconscious in the water, you're toast- he sinks to the bottom of pool and drowns.