I believe you may be referring to the Führerbunker, also known as the "Dunker Bunker," which was a complex of underground bunkers located in Berlin, Germany, during World War II.

The Führerbunker was built between 1936 and 1944 and served as Adolf Hitler's final headquarters during the Battle of Berlin in April 1945. The bunker complex was designed to protect Hitler and his inner circle from Allied bombing raids and had several levels, including living quarters, a conference room, a study, and a communications center.

It was in the Führerbunker that Hitler spent his final days as Allied forces closed in on Berlin. On April 30, 1945, Hitler committed suicide in the bunker along with his longtime partner Eva Braun. The bunker was later destroyed by Soviet forces.

Today, there is little remaining of the Führerbunker, but a memorial plaque marks the site where it once stood in central Berlin.