That's escape artist David Merlini who just broke the world record for longest time spent underwater:
With his hands tied by five sets of police handcuffs, Merlini was locked down with 60 pounds of chains.
He was then padlocked in a metal cage and lowered into a locked transparent tank of water. [...]
Entertainer David Merlini posted a dizzying time of 10 minutes and 17 seconds without a breath while chained and handcuffed under water in a glass tank.