Tunnels of Okinawa premieres Oct. 12

Nazi Mega Weapons and WWII Mega Weapons uncover the engineering feats that sparked a technological revolution and changed warfare forever.

| WWII Megaweapons
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PHOTOS | The Tunnels of Okinawa & Battleship Yamato

In 1934 the Japanese begin designing The Yamato, the most powerful battleship in history. And on Okinawa, the Japanese decide one island will be their last bastion of defense.