The bunkers are a safe haven in the middle of a catastrophic, planet-threatening event.
In the harrowing disaster thriller Greenland, Gerard Butler makes a promise to his child, which ends up being very hard to keep.
So when I spoke with the cast of Greenland, I asked them if they knew whether or not those bunkers were real, and their answer can be found in the video above.
Citizens of the world risk life and limb to get to those bunkers.