A new video of an underwater training for the US Marines only increases more our respect for marines. As a Marine you have to be prepared everywhere , including in the most fearful situations in the water.
In order to act properly in this situation the marines need to be trained. A workout that primarily looks to us as our worst nightmare.
The training is done at Camp Hansen in Okinawa, Japan where we see the Marines do a simulation exercise. They steps into a sort of cockpit (a crashed helicopter to propose) that is immersed in water after the Marines just have to get out.
But it gets more complicated. For the same training they need to perform in the dark and on the head. All to emulate, all possible situations.
Check out the video