This abandoned Cold War bomb shelter in Kaliningrad, Russia -- photographed by Andrei Pep Novozhilov -- looks horrible now. But even if it were new, surviving a nuclear holocaust in this claustrophobic space with 1000 other humans sounds like a real nightmare -- even worse than being vaporised.
From the moment you step through the blast-doors -- specifically designed wide to admit a lot of people -- you are entering into a confined, subterranean world with no natural light.
Large corridors and communal living are very much the order of the day and with so many people together in such confined spaces it is hard to imagine that very much real intimacy would remain.
Sleeping conditions are basic with rows of bunk beds extending down rooms that look little better than corridors. It is not easy to picture yourself here for a number of months or even years.
The facility appears to have been completely self-contained with diesel-powered generators, fuel tanks, a ventilation system and seemingly miles of pipe.
It is curious to spot that a red telephone remained intact, even years after the facility was abandoned, presumably once ready for that doomsday call that thankfully never came.
There are many other artefacts left behind that offer a glimpse of life underground, including oil lamps, civil defence instructions, unusual shaped hats, obligatory gas masks and a calendar from 2008 that perhaps dates the last occupancy.