"How far down, Cobra Commander?" When Cobra Commander tells these guys to "jump" they ask, "How far down?" More slimy than the slickest oil spill, Sub-Vipers would rather spend their time in the dark, muddy, frigid temperatures of the ocean depths than on dry land. They are specially trained to remain motionless in water for hours, then attack their target and move out within 10 seconds - less if their sights are on a G.I. Joe transport ship, since the motivation is greater. They're experts at planting underwater mines in a harbor filled with G.I. Joe craft, taunting the G.I. Joe shore patrols into a chase, then... BOOM! Talk about getting blown out of the water. It's just their little reminder to the G.I. Joe team that a Sub-Viper may be all wet, but that's when he is the most dangerous.