 This explains the location of the tombs KV62 and KV63 buried in the valley floor.The usual tomb plan consisted of a long inclined rock-cut corridor, descending through one or more halls (possibly mirroring the descending path of the sun god into the underworld) to the burial chamber.In the earlier tombs, the corridors turn 90 degrees at least once (such as KV43, the tomb of Thutmose IV), and the earliest ones had cartouche-shaped burial chambers (for example, KV43, the tomb of Thutmose IV).