Sleeper Bomb
this form of explosive device was used to cripple a starship in deep space. It was attached to the ship's hull in such a way that it could continuously and innocuously drain power from the ship's core. When it reached a certain power level, the bomb would draw an increasingly greater portion of the ship's power as it approached detonation. With a shaped charge and the correct power level, the bomb exploded in such a way that it ripped a hole in the ship's hull. The impending depressurization quickly and effectively killed the ship's crew and left her stranded in space. A sleeper bomb could also be used to destroy a ship that was berthed on the ground, provided that a nearby power source could be found to draw energy from while the bomb charged.