The third body is the torpedo. Since it travels so much slower than a ballistic artillery projectile the navigation of the torpedo becomes the most important pa

The third body is the torpedo. Since it travels so much slower than a ballistic artillery projectile the navigation of the torpedo becomes the most important part of the problem to solve. A torpedo attack wan't the way it is portrayed in movies. It took hours to maneuver the submarine and plan the attack. This wasn't point and click. The course, speed, and other characteristics were programmed into the torpedo before it was launched.