Once you launch down one of two partner slides at Black River Falls, enjoy the precious few seconds of light you have left. In a moment, you’ll vanish into an impossibly long, impossibly dark tunnel that winds down the hill for 400 feet. Whichever slide you choose, a sharp bend will rocket you into a ragingly fast downhill straightaway where you’ll pick up tremendous speed.
By the way, you’ll be flying blind the entire time. The walls are totally blacked out, so you will have absolutely no idea where you’re going or where you’ve been, as you snake around impossible-to-predict twists and pivots. Tiny flickering pinholes will glisten like stars as you speed-plummet deeper and deeper into oblivion.
Then it’s onto a couple of sudden and unpredictable curves. As you can’t see where you’re going, don’t bother trying to steer. Gravity and velocity will do all the work to ensure you make a quick exit, straight into the pool.