 The low height of the bulkheads had also failed the ship, allowing for uncontrolled flooding once the water in the breached compartments had reached E Deck.The refit on "Olympic" raised the middle five bulkheads to B Deck, the others to D Deck and also extended the double-bottom along the hull up to G Deck.These improvements were incorporated into "Britannic", along with two additional bulkheads.