The Titanic and Olympic slipways were developed especially for the Olympic class liners. Made of reinforced concrete at an angle down towards the sea, the slipways are over 4ft thick in places with a framework of steel. A huge steel Arrol gantry once stood over the slipways to assist with the construction of the ever-bigger H&W ships. The slipways are now scheduled monuments and were restored as part of the development of Titanic Belfast. The Titanic slipway contains the outline of the deck of the Titanic, including the locations of the benches on board, and the Olympic slipway is a Titanic memorial garden, with decked and grassed areas representing the numbers of survivors and victims of the Titanic tragedy.