Tomb KV17, located in Egypt's Valley of the Kings and also known by the names "Belzoni's tomb", "the Tomb of Apis", and "the Tomb of Psammis, son of Nechois", is the tomb of Pharaoh Seti I of the Nineteenth Dynasty. It is one of the best decorated tombs in the valley, and is one of the largest and deepest tombs in the Valley of the Kings. It was discovered by Italian archaeologist and explorer Giovanni Battista Belzoni on 16 October, 1817. Design and Decoration Previously considered the longest tomb in the valley until the discovery of the Tomb of the Sons of Ramesses II, at 137.19 meters (450.10 feet), it contains very well preserved reliefs in all but two of its eleven chambers and side rooms. The entry corridors (Corridors B-D) are heavily decorated with symbols of the Pharaoh, like those of Ma'at and a list of Set's royal names and epithets. One of the back chambers is decorated with the Opening of the mouth ceremony, which shows the Egyptian belief that a magic religious ceremony would open the lungs and throat of the mummy, allowing them to breathe in the afterlife. Considered a very important religious ceremony, a semi-complete depiction of this ritual allows us more in-depth view of the pantheon of practices undertaken to ensure safe passage into the afterlife. Further into the tomb are numerous depictions of King Seti with numerous Gods. Chamber F depicts images of Seti with Hathor, Horus and Neith, along with intact mural examples of the Book of Gates. A shaft was cut into the floor of chamber E, its purpose unknown. Parts of the tomb ceilings have been painted with gold stars on a deep blue sky, a common motif in temples and tombs in Egypt. Numerous rooms in Seti's tomb utilize the motif. An portion of the tomb is still being excavated, known as Corridor K. Corridor K leads away, into the mountainside, from beneath the location where the sarcophagus stood in the burial chamber. The tunnel has not been properly excavated, as much of the tunnel has been filled with debris. Probing projects into the tunnel started around 2001; according to the Theban Mapping Project, "A project to geophysically explore the corridor was approved by the Supreme Council of Antiquities". No results have been made public from this excavation. The body identified as Seti's mummy was not found in his