Published in Bullet #131, 08/12/1978.
In the depths of the Atlantic Ocean, US deep-sea craft 'Trilobite' went under attack. On the mother ship, Fireball is assisting on the exploration and joins his friend in a dive to investigate. They find the craft ripped apart and the two-man crew dead. Fireball is determined to learn the cause. An old enemy named Tawn is involved.