The episode is noted for its "spooky" and claustrophobic feel, often compared to the movie The Abyss . Key Plot Points
Fans often note that Teyla is psychicly compromised or "taken over" in the 18th episode of every season up to this point. [S3E18] Submersion
The Queen activates a self-destruct sequence on her crashed cruiser. Because the facility sits on a very thin part of the planetary crust, the resulting explosion would trigger a volcanic cataclysm capable of destroying the platform and Atlantis itself. The episode is noted for its "spooky" and
Teyla senses the Wraith presence immediately upon arrival. The Queen eventually takes control of Teyla's mind to use her as a puppet to facilitate her escape. [S3E18] Submersion