Marines train the way they fight, even if that means potentially suffering injuries in the process. Since many Marine units are known for their amphibious capabilities, they must conduct training that prepares them for any watery hazards that might come their way.
One such deadly situation that Marines must ready for is a helicopter crash landing into the ocean. Although it's unlikely, Marines must be ready to escape a watery grave by successfully evacuating a flooding aircraft within a matter of moments.
As you might expect, Marines practice their escape by facing the real hazard in a controlled environment. After jumping into a pool while wearing most of their combat load, Marines swim their way onto a mock helicopter that's already halfway submerged in water.
Once they've strapped into their seats, they are blindfolded with fogged-out goggles for added stress. The helo dunker is then hoisted up into the air.
Inside the helo dunker, just seconds before the training commences.(Daily Aviation Archive)
Once the instructors give the order, the helo dunker is lowered into the water and spun about to disorient the blindfolded Marines within. Each Marine is instructed to take one last breath as they feel the aircraft hit the water's surface and plunge beneath.
Training begins as the dunker rapidly fills with water and turns on its side.(Daily Aviation Archive)
The windows in various transport and cargo helicopters are designed to be removed in a hurry. Once a Marine successfully negotiates the closed-window obstacle, they are free to evacuate the dunker and swim to the surface for some much-needed oxygen.
Once fully submerged and upside down, the Marines begin their quick escape.(Daily Aviation Archive)
The helo dunker isn't the only tool used in training for an underwater escape. Marines also train in single-man cages. Instructors roll Marines about and observe as disoriented troops attempt to free themselves from the helicopter's seat belt system.
Single-man escape cages.(Daily Aviation Archive)
This is a required training for Marine Expeditionary Units set to deploy.
Watch the Daily Aviation Archive's video below to see Marines successfully negotiate this intense underwater training — blindfolded.