Cassell - Miles
After entering at Cassell, you will be in a small room with only one way to travel. The ceiling is kind of low, and it's not very wide. It will most likely not be lit up either. After going straight for a bit (east) it will turn left (north) and go on for a bit farther. You will then reach a large pipe; to the left (west) it will be unpassable, but to the right (east again) you can continue on towards Miles. We have not yet explored this area as this turn is pretty tight.
Agnew - Cowgill/Derring
When entering at Agnew, you'll enter a well-lit tunnel in which you can stand up. To your right (south) you can go for a short bit, crossing over a plank and run into a locked gate behind which is a basement door, presumably Agnew. Turning left after entering (north) you will be able to go on for a long while. There are two grates on the left as you go through, each on the walkway near West Campus Drive. Somewhere around these gates you will notice there is a step or two up, where you will have to duck - this is where the stream runs under the drill field! Farther on, after the tunnel is no longer lit up, it will turn right (east) - you are near Davidson.
If you keep going this way you will notice a small locked gate near the floor on the left that leads into the basement of one of the buildings, possibly Williams. Farther along there is another small hole in the left wall near the ground which leads under Pamplin. It gets super tight in this sub-tunnel and we eventually turned back at one point, but there are vents from which you can see out at ground level between Pamplin and Burruss.
Back in the main tunnel, there is another exitable grate which is then one that comes out right in front of Pamplin (someone has spray painted 'Pamplin' on the wall by it). Continuing on, you will come to a left turn (heading north). Right before this turn, there is a short passage off to the right (south). Down this way there is a pretty creepy locked door which might lead to Burruss's basement, and there is a manhole with a ladder leading up to it as well. This manhole was moved on one trip we made, and upon going up the ladder we realized we were in the crawlspace of Pamplin, and could see out of the vents into the hallway that cuts through Burruss.
Back at the original turn, the lighting will most likely be back on. As you head north, it will be getting super hot, so be careful of the pipes. On your left you will see a hole in the floor with a ladder going down. As it says on the walls, this leads to a westward tunnel to the basement of Derring. If you go down here, you'll be crouching for awhile, and it only opens up in height at some points. This was a dead end when we went this way, the door to the Derring basement has likely been blocked off.
Back up the ladder in the tunnel heading north, this tunnel goes on towards Cowgill. As far as we noticed, this too was a dead end.
Miles - Power Plant
When you enter at Miles, you're pretty much immediately in an unlit, low-ceiling-ed, tight tunnel. Turning left (south) leads to a dead end - this tunnel used to connect through to the tunnel leading from Cassell according to what we have read online. Turning right (north) you will be sidestepping and ducking for a good while. At one point there will be an opening above with a ladder up to it, this is likely the basement of one of the dorms, as we have heard voices issuing from that point before. There are some parts of this stretch that are ridiculously tight, and there are up to three inches of water on the floor in some points. ***