Commander Battle and the Atomic Sub #6 (1955)

In the icy depths of Antarctica, Commander Bill Battle and his Atomic Sub crew face a sudden assault from a hidden civilization of alien warriors who emerge from beneath the ice with mysterious, high-tech weapons. As the invaders launch a coordinated attack using electric bolts and pressure guns, the crew must defend their vessel and fight back against a foe unlike any they’ve encountered—before the enemy’s next move threatens the entire nation.

In a quiet moment far from the front lines, PFC. Don Clarke drifts off to sleep on a rubber raft in the harbor, unaware that the rising tide has set him adrift—only to wake and discover an enemy submarine surfacing beneath him. With quick thinking, he devises a plan to mark the sub’s position by tethering a rope to its conning tower, hoping to alert shore defenses before it escapes.