Unlike the tactical submarines of old and new, mini-subs boast many significant differences: radial arms instead of torpedo tubes and tactical nukes, a bright color scheme such as white or yellow as apposed to the darker blue or black, and generally weighing no more than 150 tons where the largest submarines of the modern fleets can displace up to 48,000 tons.
Deus ExEditThe only instance where a mini-sub is seen in Deus Ex is during JC Denton's trip to the Pasadena Ocean Lab. He briefly boards one in order to retrieve some very important schematics from the base on the sea floor, and then again to return to the surface. Walton Simons, one of the games antagonists, also uses one in order to confront JC.
It is one of three vehicles in-game that are animated, as JC is leaving an area, the most common of which is the well known black helicopter. Also, as it is fully automated and its only use is transportation, it may be considered closer to being a bathyscaphe than a mini-sub. Its model also has an inside cockpit with commands.
There are two instances where a mini-sub is seen in Human Revolution. The first is in Panchaea, suspended in a small sub bay, near David Sarif and a few other civilians. It is seen emitting a mist of some type, a possible explanation being that it is warming up and being prepared for departure by the inhabitants of the bay. The second instance involves seeing several docked mini-subs during The Missing Link DLC, during a trip in an elevator down to the Rifleman Bank Station sea-floor labs. If the player saves Dr. Kavanagh, it is said that she escapes on one, but this is never actually shown or proven.