The hidden city under Helsinki built for the nuclear apocalypse: Finnish city has 500 bunkers where the entire population of 600,000 people can shelter from the fallout of nuclear war for months
- 500+ shelters 25m below capital can hold 900,000, a third more than entire city
- Facilities include cafes, softball courts, go karting tracks, car parks and dorms
- Their doors are so thick a nuclear blast wouldn’t leave a dent, officials claim
- City excavated 9million cubic metres of bedrock -…
