[1] The construction of the actual bunker complex of the Rock Center was started in the interwar period and it was finished during World War II.

[2] From 1965 to the end of 1999, the Rock Center hosted Hungary's air traffic Area Control Center (ACC) in accordance to an agreement between the Hungarian People's Army, the government and the state-owned airline MALÉV.

[2] Some collapsed or unstable parts of it were abandoned as early as 1944 during the Allied bombings of the world war, later some areas were sealed off during reconstructions, therefore the original extent of the complex (which was built in a former underground quarry) is unknown.

[1] The multi-level bunker system occupies parts of a former underground quarry which is surrounded by dolomite.

[1] It has at least two levels and the entrance is sealed with a roughly 30 cm (12 in) thick, hinged blast door.

[1] The RISZ building was originally three story high, later a fourth floor was built onto it by MALÉV.