Havoc's Chamberception #1 was a bastard to complete, it took me about an hour. I spent most of this evening cutting the footage down to 24 minutes, though.
Skip to around 16 minutes in if you want to see me get frustrated 'cause I wasn't doing the test in the way I was supposed to.
It's a really awesome and challenging map though. Go download it from the links above if you haven't already.
EDIT: Also the roof of my study is thin - When it rains it gets noisy in here. That's why it sometimes sounds like there's a rockslide going on in the background.