After descending to the dining room one is inside the remnants of the Tudor fort. The vaults here and in the adjacent ship room are entirely functional as they support the gun battery above. The wide chimney-piece contains an old bread-oven; here Lutyens has emphasised the age of the room with Neo-Gothic traceried windows framed by curtains which swing out to lie flat along the wall. One of the end walls is painted a rich Prussian blue, which contrasts with the herring-bone patterned red-brick floor.