The Doomsday Seed Vault Was Designed for Permafrost That Melted
In October 2016 meltwater pushed fifteen metres into the tunnel before refreezing. The seeds were fine. The premise wasn't.
On 26 February 2008, Norway dedicated a tunnel driven 130 metres into a sandstone mountain on Spitsbergen, 1,300 kilometres from the North Pole, and started shelving boxes of seeds. The Svalbard Global Seed Vault was conceived as a backup of last resort for the world's gene banks: each country mails a duplicate of its crop accessions, the boxes stay sealed and locked, and the permafrost does the refrigeration for free.
That last part was the design assumption. The chamber sits at about minus three degrees Celsius without any active cooling, because the rock around it does not thaw. Builders sized the vault for 4.5 million samples; today it holds more than 1.3 million accessions, including duplicates of seeds from war-damaged collections in Aleppo and the Philippines.
In October 2016, after Svalbard's warmest autumn on record, meltwater seeped about 15 metres into the entrance tunnel before refreezing. Photos of the iced-over corridor went around the world as proof that the doomsday vault had failed. It hadn't. The seed chamber sits behind further sealed doors deep in the mountain and never lost temperature. But the headline was correct in one sense: the design assumed the permafrost outside would stay permafrost.
Norway commissioned a retrofit. By 2019 crews had waterproofed the tunnel walls, removed heat-emitting electrical equipment from the access passage, and dug exterior drainage ditches to route meltwater away from the entrance. The vault is now engineered for an Arctic that warms, instead of one that doesn't.
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