Breath-holding exercises killed one, another critical

Tragic news link Lifeguard in critical, swimmer drowned in breath-holding exercise gone wrong at Staten Island pool Quote: "Joseph Lyons Pool is closed for the day after two men were found floating face down Wednesday. One man training to be a Navy SEAL was dead and a city lifeguard was in grave condition yesterday after they tried doing breath-holding exercises in a public pool in Staten Island. Bohdan Vitenko and Jonathan Proce, both 21, were found facedown in 3 feet of water in the Lyons Pool in Tompkinsville, where they were practicing techniques similar to those used in military training, authorities said." "the pool is 3 1/2 feet across the entire surface. An adult can easily stand in it with their head above water," " (see this report) Wonder if it is also dangerous to swim a 25m lap or as long as you can without breathing?