I think you get the hand past the gass-leak area (a worm vomits it up). You need a gas mask to get in there and it is really all you need to get the hand as well. Mask can be found next to a dead body in one of the rooms with lasertraps in it.
That's pretty general, but since I don't know specifically what your problem is .. well. Where you're at, if you get stuck in an area - don't worry. Just leave it and check out the other rooms you haven't been in yet, then come back if you have more specific questions.
Don't forget the
Spoiler below!
tags.
(This post was last modified: 02-18-2008, 11:09 PM by Trard.)