Argonaut Jr.

One of the world's only places where tourists can make a trip in a submarine.

The sail of the first nuclear sub to circumnavigate the world.

Relics designed to contain and conceal Yugoslavian submarines.

A World War II–era submarine museum where visitors can spend the night aboard.

The last surviving submarine from a strange chapter of Finnish history.

Under the streets of La Rochelle, a former wartime bunker holds some surprising secrets.

At this concrete bunker on the Trondheim fjord, secrets lie above and below the water's surface.

Outside a paint factory north of Manchester's city center, an inexplicable submarine sticking out of the ground.