An amateur explorer, known only as stats_quo, found what he believes to be an old air raid shelter at his university in a city near Düsseldorf in Germany.
Luckily he had a camera to hand to document his unusual discovery, sharing a series of snaps showing inside the bunker on Imgur.
The concrete bunker even has running water, a working telephone and a series of escape exits (just in case).
‘These pictures were taken in a city next to Düsseldorf in North-Rhine Westphalia,’ he explained. ‘ It looks pretty creepy down there.
‘The water works and the telephone has a dial tone, so i guess the shelter is still being maintained for future usage!’