No burial room of King Khufu was opened.
Debated. A scan points to a corridor nearly 30 metres long, and a robot reached a sealed stone door.
The pyramid is at Giza, in Egypt. It has stood for over 4,500 years. The page says the corridor is behind the north face, just above the main entrance, and has stayed untouched since the Fourth Dynasty. King Khufu's body has never been found. The stone coffin in the King's Chamber was empty.
The page only suggests that the corridor might lead to Khufu's grave.