It's all fun and games until the chopper hits the water. I'm personally amazed the one on the right managed to lift out and get away. Choppers must be tougher than they look, and sometimes pilots are luckier than they deserve. Consensus on Fark, where I found this, is that they're a couple of junior pilots practicing legit maneuvers who got caught out by the high altitude. Apparently no significant damage would've resulted, but they probably kept the maintenance guys busy for the rest of the day cleaning it all up.