An oddly shaped submarine, serves as a much more pragmatic alternative to the standard Dugong and Barsuk. Includes dual airlocks, a ballast shutoff and draining mechanism, and higher than average cargo space for its cost. Also includes fabrication facilities, and has relatively unrestricted weapon rotation, allowing for the killing of enemies in hard to reach areas. The only real downside is the window in the navigation compartment; any captain unfortunate enough to pilot the Slough will learn to heed the ping of the sonar. It is rumored that the design is loosely based on the locomotives of Earth, but it is doubted that the creator had this in mind.