I'd post the screenshots of the game the other day where we relocated into a vent, but they're too dark without the gamma correction to tell what's going on. It was on ns_eclipse, and we were having a goofy game, playing hunt the onos with 6 marines armed with knives and such. I suggested relocating across the room (they'll never suspect it!) and instead we went around to horseshoe, boosted up into the vent, and built a CC and IPs there. The vent is weldable from the inside, we found, so we squeezed in an armory (barely) and welded ourselves in. Then an alien came in, egged, and went onos inside the vent. Giggles were had by all. Of course once they decided to the aliens finished us pretty quickly with lerk gas and acid rockets. And the skulks running into the vent and xenociding. Ahhhh, much hilarity.