The outer hull, which accommodates the main ballast tanks and external fuel tanks, and fines off the form of the vessel forward and aft, is built outside the pressure hull .
Umphandle wesiqu senqanawa, owamkela amatanki anzima ezilayishiweyo ukuzinziya inqanawa kunye namatanki angaphandle esibasi, kwaye ukugqityezelwa kohlobo lwenqanawa ngaphambili nangasemva, kwakhiwa ngaphandle koxinzelelo lwesiqu senqanawa.