Nazi Mega Weapons: U-Boat Pens

Nazi Mega Weapons: U-Boat Pens

Wednesday, July 24 at 10:00 p.m.

Learn about the impenetrable submarine pens the Nazis built to protect U-boats from Allied attacks.

To create a haven in port for their lethal U-boat submarines, the Nazis built massive concrete submarine pens. Structures too immense to be hidden, they were constructed to withstand direct hits from even the biggest Allied bombs. Such was their size and strength that these pens survive today, a testament to their engineering.

Photo: A scene from "U-Boat Pens."