Mass Effect 2
The Systems Alliance Space Vehicle Normandy is a prototype starship created as a joint human and turian venture. A frigate optimized for reconnaissance missions, the vessel uses state-of-the-art stealth technology.
Most ships generate tremendous heat that is easily detectable against the absolute-zero background of space. The Normandy, however, temporarily sinks this heat within its hull. Because of exterior hull refrigeration, the ship can travel undetected for hours, or drift passively for days of covert observation. That heat-sinking carries the risk of cooking the crew alive if the stored head is not eventually radiated.
Also contributing to stealth is the Normandy's revolutionary Tantalus drive, a mass effect core double the standard size. The Tantalus generates mass effect concentrations that the Normandy "falls into," allowing it to move without the use of heat-emitting thrusters.
Mass Effect 3
The SSV Normandy SR-1 was a prototype starship developed by the human Systems Alliance with assistance from the Citadel Council. The ship employed uses state-of-the-art stealth technology for reconnaissance in dangerous regions.
Most ships emit heat that is easily to detect against the absolute-zero background of space. The Normandy, however, temporarily store its waste heat within the hull., allowing the ship to travel undetected for hours-or drift passively for days of covert observation. This was not without risk. Eventually, the stored heat had to be released, or it would build to levels that could cook the crew alive.
Another key component of the Normandy's stealth system was the revolutionary Tantalus drive, a mass effect core twice the size of a standard unit. The Tantalus drive generated mass effect concentrations that the Normandy "fell into," allowing it to move without the use of heat-emitting thrusters.
The Normandy SR-1 was destroyed in 2183 when it was ambushed by a Collector ship in the Omega Nebula.