The engineering level is built around a tall central core, with entrances to the top and the bottom of the core from each quadrant. So if you can get into the core you can use it to cut across to anywhere on the level; otherwise you'll have to go around. Most of the level is broken up by narrow, twisting access passages, so beware of ambushers in these areas. There's a medical area just 'south' of the core and an armory to the 'east.' Computer systems are between these two areas.