17 photos that show the military's water-survival training is no joke

America's amphibious Marine Corps and Navy SEALs are some of the most elite fighting forces on the planet, with the ability to deploy in all environments - especially the sea.

That's why the military has created schools to prepare operators from all the sister-service branches to be physically fit, mentally tough, and responsive in high-stress aquatic situations.

During combat water-survival exercises, candidates swim with their hands and feet bound, assemble machine guns underwater, and take on the seas in full combat gear.

Below, we've collected 17 pictures showing just how rigorous their training can be.