The team discovers an Ancient drilling station deep beneath the surface of the ocean, only to find that a Wraith queen is still alive there.
PRODUCTION
"'Submersion' takes place completely underwater. We don't even see Atlantis. The team is exploring a new piece of Lantian tech they discovered on the ocean floor, when they are ambushed by an unexpected enemy. A very old, very angry enemy." (Writer Ken Cuperus, in an interview at Stargate-Project)