A Long Tunnel
On closer inspection, the metallic curtain is actually some heavy fabric material that has been made to shine like polished steel. Thick enough to muffle sounds and stop drafts, it bears the now familiar N.I.C.E. logo that you have seen all around the Science Labs. No expert on cloth, you've still never seen anything quite like this before and you wonder how you would look if it were cut into a suit for you to wear when doing your John Travolta impression at the local disco. Maybe your dance partners would spend too much time using it as a mirror to adjust their makeup instead of paying attention to your own gyrations? Or maybe your brain is still a little scrambled from what you have witnessed and these inanities are just it's way of trying to limp back towards normality?
Whatever... you find it easy to slip through the curtain and away from a madhouse where scientific experiments seem to consist solely of making girls cum - something you fervently believe should be your own province; and without any machines or insects to help out either! Physically shaking your head goes some way to clear out those reawakened images and you look around. A long metal tunnel illuminated by soft concealed lighting leads downwards and then levels out. It continues on, stretching way beyond your line of sight and off into the distance. Exercise, at least of the vertical variety, is not your strong point but you don't want to return to those lab experiments and all that nubile flesh. Flesh that was wasted really, when you could have found a much better use for it in your bed. With a shrug you step forwards.
Although not carpeted, the floor seems to have some way to deaden the sound of your feet as you begin to trek down it. It seems the tunnel goes on forever and though your sense of direction is hazy you do wonder if it leads right under the sea to some other island, or even further. Maybe you should have brought a packed lunch. Or an electric golf cart! Finally however the endless tunnel does end, in this case with another ramp, this one leading back upwards, presumably towards the surface. An identical curtain shields your view of what lies beyond.