The large fin houses the conning tower hatch and an access door onto the casing. Optronics masts housed in the fin carry CCTV and thermal imaging cameras, superseding the traditional periscope functions and offering day/night vision even in bad visibility, although a direct-view electronic periscope is also carried.
The pressure hull forward of the reactor compartment has four decks and aft of the reactor compartment has three deck levels All command and control functions are in self-contained rooms leading off the main thoroughfares.
HMS Victorious
SSBN06 was ordered on October 6th 1987, laid down on December 5th 1987, launched by shiplift on September 29th
