Yes it is cold, 60 degrees.
Not bad in a 5mm, cold water hood, and gloves. Drysuit would be better.
It is deep, expect to see 104 to 110.
It is disorienting if you try to make a free descent off of the downline. Stay on the line.
It is easy to find your way if you remain against the wall and guage yor ascent from it or watch your guages closely.
A good dive is a steady descent down the line to 100' for 12 to 15 min. Over to the wall for an ascent to the launch control @55' for 10min, then safety stop @15 for 5-7 min. under the platform. The water is 100' vis but there is nothing to reflect your lights until you reach bottom. It might as well be a night dive. On the way up the platform is visable from the bottom. Very cool and different dive. Be in good shape, there is a lot of stairs to climb.
You can camp in the control room. It is a constant temp. Not very scenic in there. I prefer to stay in town and dive both days. 2 dives on Sat. and 1 Sun. Many people camp out and dive at night. Its a slumber party!
I'm in. Are you doing this through a LDS? I believe there is insurance involved. If not, I am sure one would be glad to pick it up.