Apparently they were not considered if they had to do major retrofitting. > In October 2016, the Seed Vault experienced an unusually large degree of water intr

Apparently they were not considered if they had to do major retrofitting. > In October 2016, the Seed Vault experienced an unusually large degree of water intrusion due to higher than average temperatures and heavy rainfall. While it is common for some water to seep into the Seed Vault's 100 m (328 ft) entrance tunnel during the warmer spring months, in this case the water encroached 15 m (49 ft) into the tunnel before freezing.[21] The Seed Vault was designed for water intrusion and as such the seeds were not at risk.[21] As a result, however, the Norwegian public works agency Statsbygg completed improvements to the tunnel in 2019 to prevent any such intrusion in the future, including waterproofing the tunnel walls, removing heat sources from the tunnel, and digging exterior drainage ditches.[22][23]