At the same time, and just opposite his own tomb, Ramesses enlarged the earlier small tomb of an unknown Eighteenth Dynasty noble (KV5) for his numerous sons. With 120 known rooms, and excavation work still underway, it is probably the largest tomb in the valley. Originally opened (and robbed) in antiquity, it is a low-lying structure that has been particularly prone to the flash floods that sometimes hit the area. Tonnes of debris and material has washed in over the centuries, ultimately concealing its vast size. It is not currently open to the public.