A Short Story on a Seal's Most Valuable Tool

Although numb with shock, his body, seconds after hitting the icy ocean, moved into action with an instinct born of countless hours of training.
With a quick thrust of his legs, the diver plunged downward. Moving with the confidence of a man who knows exactly what he's doing, the diver quickly oriented himself and prepared for the evolution.
It was going to be a long night - a three-hour op in 42-degree water - no sense wasting time.
Even with his illuminated compass board, vision was limited to six inches in the inky black water. …