Common in all ships of that time, due to the coal bunkers underneath the central section there is no space for anything much apart from the ovens. Due to the inaccuracy of naval artillery impact from long range shelling which could have penetrated the top plating was nearly impossible then. The coal on the otherside even acted as defensive feature during short range, direct fire shelling, something which had to be revised urgently with the switch to oil burning vessels. With the needed plating on the side and top of the hull being far heavier in contrast to the older, coal burners this brought several poor designs as would be shown in WWI, where several Battlecruisers and Cruisers would be hit by a penetrating shell into their engine room or even main arsenal and explode. It was from and during that time onwards that ships increasingly regained their central structures and platings.