KV20

The tomb has an unusual layout. It consists of a series of five curving, descending corridors, interspersed with sections of steep stairs and passing through two chambers and an antechamber before ending in a pillared burial chamber with three small satellite storerooms. The corridors bend east-south-west in a clockwise fashion, which is a unique feature among the tombs in the valley. Beginning halfway down the first corridor are sockets, likely to have taken the timber supports used to lower the sarcophagus. The corridors also have steps cut along one side, with the remaining portion forming a ramp. Another unusual feature is the tomb's extreme length of 210 metres (690 ft).

KV20 is located in the easternmost branch of the valley near the later tombs KV19, KV43 and KV60.

The tomb was known to the French expedition of 1799 and to Belzoni, who worked in the area in 1817. James Burton made a first attempt to excavate it in 1824, clearing it as far as the first chamber. Lepsius explored it in 1844 and 1845, but no further excavation was undertaken until Howard Carter began clearing the rock-hard fill in the corridor in the spring of 1903. Carter worked as Inspector of the Antiquities Service, and the work was sponsored by Theodore M. Davis, who published a full report in 1906.

No further activities have been carried out since Carter's work ended. The ceiling of the burial chamber had suffered a further collapse when John Romer visited the tomb in the late 1960s. Since 1994 the burial chamber has been inaccessible because of debris deposited by flooding.