 The armour was reduced to thick above the waterline, with a outer plate and an inner one, with the thickness of teak increased to to maintain the same overall thickness of protection.Below the waterline, again there was a outer plate, but with a inner plate, with of teak backing in total to maintain the overall thickness of protection at 41 inches.Outside the citadel, above the armoured deck were a large number of small watertight compartments used to hold coal and stores.