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Japan builds the Yamato -- the biggest battleship in the world.

WWII Megaweapons

Battleship Yamato

Japan builds a network of defensive lines, bunkers and fortifications across the island of Okinawa.

The Tunnels of Okinawa

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Efforts by the Japanese to dominate the Pacific include defensive lines across Okinawa and the building of the biggest battleship in the world.

S1 E1 | The Tunnels of Okinawa