Description
When a helicopter crashes into water, it will likely roll over and water, fuel, oil, and debris will begin to rush in. Sinking can occur at any time, often to depths incompatible with survival. Disorientation, confusion, panic, loss of vision, loss of balance, loss of physical reference, false perception or orientation, and in some parts of the world, the effects of extreme cold, are all factors that the occupants may encounter.
Helicopter Underwater Escape Training (HUET), also sometimes called Helicopter Underwater Egress Training, serves to ensure a successful egress from a submerged helicopter and for trainees to develop continued survival skills after a successful egress when they find themselves in a potentially hostile marine environment.

HUET training (Source: LifeFlight Training Academy, Aug 23)