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Egyptian thermal passage 800mm deep
Egypt's Great Pyramids of Giza may hold a secret tomb yet to be discovered by archaeologists. Thermal cameras have recently detected higher than expected temperatures in three adjacent stones at the bottom of the Great Pyramid of Khufu, which may indicate a hidden chamber. Temperature anomalies have been recorded in the 4,500-year-old burial structures, including a major one in the largest. Built during the Fourth Dynasty of the Old Kingdom, around 2580–2560 BC, it was constructed as a tomb for Pharaoh Khufu, and it remains one of the Seven Wonders of the Ancient World.