What a submarine conning tower does on the surface

What is inside a submarine conning tower, and what is it for?

It supports surface conning and navigation from an elevated position, along with masts and other raised equipment.

The conning tower provides facilities for controlling a submarine while it is on the surface. Its height gives the watch a better view than a position close to the waterline. That elevated position helps with surface navigation. The structure also accommodates masts and other equipment that must be raised.