Zeppelin was built in 2 years and was a communications bunker during WW2. It was built on 3 levels with the lower floor at a depth of 18m.

When the building was taken by the Soviets on the 20th April 1945 they were amazed at its size and complexity. As per the Allied agreement at Potsdam they made a half hearted attempt at destroying it, after removing anything that could be taken. Very little damage was caused though water soaked in.

The Soviets later decided to reuse the Zeppelin as a communications centre and nuclear bunker and renamed it Ranjet after an apple.