The Tower Hill Memorial in London is a pair of Commonwealth War Graves Commission memorials commemorating 36,087 civilian merchant seamen who were lost at sea in the First and Second World Wars. During the First World War, 3,305 merchant ships were sunk with a total of around 17,000 crew and personnel lost. In the Second World War, 4,786 merchant ships were sunk with a total of around 32,000 crew and personnel lost. Not all these ship losses are named on this memorial, as some ships were sunk or captured with no casualties. Similarly, some of those named on the memorial died in incidents or battles where the ship was not lost.