Walk In SafeOr a Wine Cellar. Or a Panic Room. Or a FallOut Shelter.
This is a serious piece of reinforced concrete. The walls are 250mm thick; the door is 100mm solid steel.
They REALLY didn't want the bad guys helping themselves.
Inside measurements are 3.2m X 1.8m. 400mm wide shelves 2m high (room is 3.3m high, like rest of this floor) with cupbords along one wall and shelves along the rest.