Cobra's Eels have some of the most rigorous training for underwater specialists. They are trained to operate in almost every aquatic environment, from shallow basins to lakes to shark-infested waters and even the frigid depths of the polar regions. In addition to the physical aspect of their training, they are expected to learn marine structural engineering and marine geology. Add ordnance training and underwater combat and you have some of the most effective underwater demolitions experts. When they're not on assignment, Eels serve on marine outposts and also augment personnel on Cobra naval vessels.