If it's a doomsday vault how could it flood so soon?

https://www.wired.com/2017/05/arctic-doomsday-seed-vault-flooded-thanks-global-warming/

If the seed vault was supposed to withstand doomsday then how could it flood when they're not even done filling it yet, because the weather's a little worse than expected?

You'd think global warming would have been taken into account for a few more decades at least.

Could they have designed and placed it in order to generate headlines?

 

View: https://www.youtube.com/watch?v=a97J7j84gWY