Using a procedure that Keller develops, Joe, Holmes, and Keller modify three hundred of the torpedoes they find in the fortress and launch them. The ten-foot spheres accelerate toward the enemy squadron at 160-gees, approaching the speed of light in little over two days. The torpedoes obliterate the Enemyâs squadron and everyone breathes a sigh of relief. Then Joe notes that in a few centuries Humanity will have to go out into interstellar space to look for the Enemy.