US President Franklin Roosevelt came close to dying in a massive explosion thanks to a serious blunder on November 14, 1943.

Roosevelt was inspecting a series of naval drills on board the battleship USS Iowa .

Destroyer USS William D Porter was tasked with simulating a torpedo launch at the Iowa .

But a live torpedo was mistakenly fired from the Porter directly at the battleship.

Under strict orders not to break radio silence, the Porter relayed a message via a signal lamp about the incoming torpedo.

But the message was misread and the Iowa did not react as it should.

As the torpedo closed in, the Porter radioed the larger ship with a coded message.

The Iowa turned hard to avoid the torpedo and trained its own bigger guns on the Por

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