 Vanguard 's design was revised again , while the ship was under construction in 1942 , to reflect lessons learned from the loss of the King George V @-@ class battleship Prince of Wales and operations with the other battleships . The space between the inboard and outboard propeller shafts was increased from 33 @.@ 5 to 51 @.@ 5 feet ( 10 @.@ 2 to 15 @.@ 7 m ) to prevent a single torpedo from wrecking both shafts , and watertight access trunks were added to all spaces below the deep waterline to prevent progressive flooding through open watertight doors and hatches as happened to Prince of Wales . This change and the relocation of some of the 5 @.@ 25 @-@ inch ( 133 mm ) ammunition handling rooms from the lower deck to the middle deck seriously delayed the ship 's completion . The design requirement that the guns of ' A ' turret be capable of firing straight ahead at 0 ° of elevation was sacrificed to allow her freeboard forward to be increased , and her bow was reshaped to make it less prone to shipping water and throwing sea spray in head seas . The ship 's fuel supply was increased from 4 @,@ 400 long tons ( 4 @,@ 500 t ) to 4 @,@ 850 long tons ( 4 @,@ 930 t ) to prevent the fuel shortage problems suffered by King George V and Rodney during their pursuit of the German battleship Bismarck . The Unrotated Projectile mounts were deleted from the design , and the light anti @-@ aircraft armament was increased to a total of 76 two @-@ pounders in one quadruple and nine octuple mounts and 24 Oerlikon 20 mm cannon were also added in 12 twin mounts . Space for these was made available by removing the two floatplanes , the catapult , and their associated facilities . 
