What Game/Mod/Addon Would This Level Be From?

[ToxicHolyGrenade]

As far as I've remembered as a kid, though that could be an entirely different level (addon/mod) or even a different game back then, but in some level, I remember there was a dark corridor with misty openings that makes the player slide down, and then teleports back into the corridor. What level/game/mod would that be?

[tcassat]

Maybe it's the "technology test" map from the original Serious Sam and you're remembering it wrong?