* '''gas, cold water, exhaust lines''': they picked every possible place and angle to confound your movements. You'll be playing limbo and you'll get very sweaty and tired.
* '''loneliness''': You're probably up there to lay wiring from one part of the building to another (I was), so you will need help! You'll need someone to feed wire from inside SudoRoom, and possibly someone else to receive it on the other end. You can't just pull on the wire because it will get kinked and caught on [all of the above]