On July 30, 1942, the German submarine U-166, under the command of Lieutenant Commander Günter Küchelmann, was patrolling the Gulf of Mexico. After the explosion of the American steamer, escaping the attack of the destroyers, the submarine lay on the ground. When she surfaced again, the sea turned out to be clear - no destroyers, no wreckage of the ship. From that moment on, strange things began: days passed, and the radio broadcast was silent on all frequencies, any ships ceased to be seen on the sea, where previously the entire coast was glowing with a glow of lights, there was complete darkness. In a word, devilry. Two subsequent events will affect the fate of the submarine U-166 (and subsequently the course of all world history): first, sailor Bruno Lorenz will dive with scuba gear to inspect the propellers and the underwater part of the submarine’s hull; second, they will finally meet the ship, but... strange. A typical caravel from the 15th-16th centuries. Barrels protrude from cannon ports, and bearded men with sabers at their sides walk around the deck. On top of that, bodies of people, men and women, begin to be thrown overboard from the sailing ship. This is where it all begins...