Thanks for the great information! I think I know what you mean about the changes - I see a hatch there next to the TDC in-game, but when I look at "Conning Tower Aft" photos of the USS Pampanito, it's a solid wall, so that might be part of the changes. The USS Torsk does seem to have the hatch, but when I toured it, the conning tower was not accessible.
In the USS Growler photo then, if I'm interpreting it correctly, you would climb up a ladder from the conning tower to the bridge, and you'd end up in the space underneath those portholes. Then you would ascend a few steps to the main part of the bridge where the lookouts were. So during a crash dive, for example, you'd descend those steps and climb down the ladder back inside.
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