We built a seed bank to preserve food crop seeds against all disasters and catastrophes and buried it in the the world's biggest deep freeze, the Arctic permafrost. It is buried inside a mountain on Spitsbergen, and global warming has produced such unimaginable temperatures there that meltwater flooded into the entrance tunnel.

https://boingboing.net/2017/05/20/the-arctic-seed-bank-that-was.html