Seems like you are not allowed in any conning tower. I have been on the Silversides, Cod, Crocker, and Lionfish and was not able to get into the conning tower. Something to do with liability insurance. Guess they don't want anyone falling from there to the control room. You can only climb the ladder and maybe get from your shoulders up into the tower to take a look.
I was on the USS Cero in the late 50's and they did allow you up there. Was very interesting.
The Pampanito along now with the Cod I believe are the only WWII subs with working TDC's!
Happy Hunting