French hosting company Online.net has revealed its new data centre resides in a former nuclear fallout shelter.
The company explains that its new bit barn was once a passive defence shelter named Abri Lefebvre built in 1937 atop a disused quarry out in the fifteenth Arrondisement.
In 1946 authorities decided Paris needed to harden up to cope with nuclear weapons.
As Online.net's post explains, the bunker fell into dis-use for years and the French government eventually sold the buildings above in 2012.
Online.net thought there was potential for a data centre so snapped up some of the land.
The post we've linked to above outlines the considerable effort required to turn the bunker into a bit barn: suffice to say there's been digging, remediation of many sorts, waterproofing a-plenty, figuring out what to do with a well that wasn't on the maps, adventures with pre-stressed concrete and lots of graffiti removal.