Board Thread:Warhammer 40k General Discussion/@comment-6078851-20130318203252/@comment-3580035-20130401104330

The vault is called the Omega Vault and is situated in Watch Fortress Erioch in the Jericho Reach. It was already there when the Deathwatch first settled in the Watch Fortress, and all that is known for sure about it was that it was made by humans. This is because of the fact it contains a virus that will kill anything that enters the vault except humans.