A strange giant “sea monster” has been rampaging the seas. The United States naval ship Abraham Lincoln is sent to investigate, but the vessel is rammed and damaged by the “monster” which turns out to be Nautilus, the technologically advanced submarine of the enigmatic Captain Nemo. The Abraham Lincoln, now rudderless from the attack, is adrift. Then, in a “strange rescue”, Nemo guides his submarine directly beneath four people who had been aboard the American ship and who had fallen into the sea during the attack. Nautilus surfaces and Nemo’s own crew now bring the four individuals into the submarine through one of its deck hatches.