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Le Grand Bunker was the German command post for the Atlantic Wall defences at the port of Ouistreham, at the very eastern extreme of the D-Day beach landings on Sword Beach.
Today, the bunker has been converted into a museum (the Atlantic Wall Museum to be exact) featuring landing craft, a V1 rocket and tanks outside and multi-level displays of WWII guns, grenades and other equipment inside, as well as maintaining features of the defence bunker itself.
The video features some general views inside and outside the bunker and ends with a model showing a cross section of the German beach defenses at Normandy.