OK, I can go on any roller coaster, and it hardly even phases me. I've yet to meet a curvy, twisty road that bothers me in the least bit. I love to spin the tea cup rides so fast that you can barely move your head, and none of that bothers me at all - yet that underwater ship graveyard level almost did me in. I've never had a computer game make me feel as sick to my stomach as did that dumb underwater level. I don't know if it's because of the way you are constantly leaning to one side or the other, but whatever it is, I had to stop the game to let my stomach settle down.
Did anybody else get that same feeling from that level?

I suppose that I could talk about how frustrating it was at times trying to find the next light, or trying to line up a shot while leaning sideways, but none of those things bothered me like the disorienting feeling that level gave me.

That is one experience I hope to never face again in a game.

Ha! I'm replaying Chaser for the 3rd time tonight, and I j-u-s-t finished that level! Hey, not just one level but TWO levels of underwater barf madness! I always try to find a "roll left/right" key like DESCENT had so I could re-orient myself "straight" again, but there isn't one. So like you said, you are swimming at a totally non-level non-parallel-to-the-walls angle in these underwater submarine wrecks the entire time. Brutal!

I'm at the 2nd part of the underwater levels and I can't seem to figure out where to go. Right now I'm stuck inside a large ship and I can't find the next light. I haven't been able to find a decent text-based walkthrough of this level. Does anyone know of a place where I can find a map of this level?

Update:
I finally got past that part! The whole level is literally stumbling in the dark! I have no idea why they'd disabled the night vision goggles for those levels.