Three times as large as American submarines, the I-400 was designed to rise and sink quickly, allowing just enough time to catapult into the air one of three specially-designed aircraft stored inside. As the Cold War escalated, the United States military feared what could happen if the machine landed in Russia's hands. By agreement, the two countries were to share any military technology after the war. Less than 10 months after World War II ended, the United States military sunk the sub off the coast of Hawaii, making Arvidson one of a scattered few to see it.

Interesting ...