Atlantis

Atlantis is a legendary Earth continent/city which vanished cataclysmically into the sea ages ago.

Cybertron

Atlantis is a spaceship in the ocean. The spaceship is one of four (Atlantis, Pangea, Lemuria, Mu) that is named after a lost continent. This one contained the Omega Lock.

From Teletraan I: The Transformers Wiki, a Wikia wiki.