It is a four story hike from the surface down to the dive site.
I staged my gear in the control room and then donned the gear there and walked a short distance to the silo. At the silo door you descend down stairs to the water and the stairs are quite steep. Clip everything off you can so you can use both hands or have someone as surface support to collect your loose gear- a very big help. At the water level you are on a floating platform (nothing new for divers.) Then you can hop in or sit down and roll in.
Water temperature WAS 52 degrees and either you use a semidry with seals or a drysuit. Dont forgot to say hello to the water (splash your face.). I would recommend a drysuit. From the surface it is vertical drop down to 110ft at which point you reach the wreckage of the silo. Reportedly, the bottom is about 130ft. I was feeling the narcosis in a rented Semi-dry because my drysuit had not arrived- have to love the irony of that. The walls are obviously curved and my 10watt HID light was almost a pain in the butt. The concrete seemed to absorb the light and at the same time reflected much of it. I almost went to my SL4 backup light.
Since the walls are vertical there is very little depth perception. So it is a total instrumentation dive for depth. They did have vertical lines that you could grab if you needed. This was nice for safety stops. I would recommend good navy class A regulator or something that has scored well on ansi machine test. This is not something you want a cheesy entry level regulator- my choice was Poseidons. However there are lots of great regulators out there.
One the way up there is a service shack and you can stop in and see a few things there. Often it seems people take pictures at the shack or at the bottom- not much in between.
So that leaves exiting the water, climbing up the stairs and heading back to the control room. There we stripped out of the suits and walked up the surface for refreshments and relaxation.
The biggest understatement is moving gear. For me that was a steel lp95 tank, weights, and wet dive gear on the way out. Plus, I brought out my girlfriends gear also. It took specifically 4 trips to get the gear out- 1 for weight, 1 for tanks, 2 for dive bags and odds and ends.
If I did it again. I would take my tanks down to the site (command room.) Then relax and walk back up to the surface where I would gear up and walk directly down to the command room, zip up and then mount up my tanks. In the future I would probably us a weak trimix blend and 32% in an Al40. That would help take the edge off. If nothing else I would recommend EANx32 (nitrox 32) for the dive.
Dive training magazine article-
www.dtmag.com/dive-usa/TexasMissileSiloTX.html
If you need specifics- talk to Debra or Allan from SI Scuba they make the trip about once a year.
Good luck, Andrew