Stuck in lab 4, killed everyone, destroyed everything i could find, only thing left is to find the stupid doctor!!!!!!! looked everywhere been going in circles for 2 days ;-( according to the walkthrough,
The shield that previously covered the equipment will be going haywire, raising and lowering. Jump on it, and ride it to the ceiling near the vents above. Crawl along next to the vents until you hear someone yelling at Dr. Sestrogon. When you reach the end of the area, you'll fall through into the room below.

been there, done that- i NEVER fall through to any room below!! any freaking ideas???? i USED to love this game ;-)

Hmm just do what do walkthrough says, you must be doing sumething wrong. Maybe replay the lvl.

thanks, i`ve done that, no luck!! i even went back to start of labs 1,2,3 did them again first, still nothing!

It gets dark at the first turn you have to crawl through. i dont think you've crawled far enough. you have to go round a couple of corners... use your NVGoggles.