Navy SEALs during drown-proofing training. US Navy In this excerpt from 100 Deadly Skills: The SEAL Operative's Guide, retired Navy SEAL Clint Emerson explains how to survive a drowning attempt.

When an operative is captured in hostile territory, the odds of survival are low.

Instead of being taken to trial, he will likely simply be made to "disappear" — which is why operatives practice escaping while wearing undefeatable restraints on hands and feet, both in water and on land.

Tied up, thrown into open waters, and left to drown to death, the well-trained operative still has recourse to a few skills that can help extend his life until he is found or reaches solid ground.

When it comes to self-preservation in water, the key to survival is breath control. With the lungs full of air, the human body is buoyant — so deep breaths and quick exhales are key.

Buoyancy in freshwater is more challenging but still achievable. Panicking, which can lead to hyperventilation, is the number-one enemy to survival.

Restraints and body positioning may make breathing a challenge, but repositioning is always within the Nomad's grasp. In shallow waters, use a sinking and bouncing approach (see diagram below) to travel toward shore, ricocheting off the seabed or lake floor up to the surface for an inhale.

When facing down, whether floating in place or using a backward kicking motion to swim to shore, the operative should arch his back in order to raise his head above water.

In rough seas, this may not give him enough clearance to get his head out of water. Instead, a full body rotation will allow him to take a deep breath and then continue traveling forward.

"100 Deadly Skills" by Clint Emerson

Republished with permission from 100 Deadly Skills: The SEAL Operative's Guide to Eluding Pursuers, Evading Capture, and Surviving Any Dangerous Situation by Clint Emerson. Copyright © 2015 by Escape the Wolf, LLC. Reprinted by arrangement with Touchstone. All rights reserved.