 Above the upper armour belt there was a deck that ran the full length of the ship that consisted of a 50 @-@ millimetre ( 2 @.@ 0 in ) armour plate laid on 10 @-@ millimetre ( 0 @.@ 39 in ) deck plating . At the top of the waterline belt was two layers of 20 @-@ millimetre ( 0 @.@ 79 in ) armour . It also extended the full length of the ship , but not the full width ; it curved downward behind the belt and was connected to the lower edge of the belt by a 20 @-@ millimetre plate . It continued downward to the ship 's inner bottom plates and formed a sort of torpedo bulkhead . This bulkhead was 2 metres ( 6 ft 7 in ) from the side of the ship and extended for a length of 84 metres ( 275 ft 7 in ) . It was backed with coal bunkers . 
