A Blackfathom lacked the underground levels due to it being aquatic based, but it compensated for this with several powerful repulsorlifts to keep it afloat, even during the heaviest waves. In addition, it was equipped with underwater hangar bays. The contingent included seatroopers, repulsor-subs and AT-AT swimmers. It is implied that the repulsorlifts ability to withstand heavy waves was the result of an incident on Shaum Hii that caused a NewsNet frenzy.
- Star Wars: Imperial Handbook: A Commander's Guide (First identified as IM-A-761 Oceanic Garrison, simultaneous with The Blackfathom)
- "Imperial Garrisons"—Star Wars Adventure Journal 12