The Watchtower seem to acknowledge that the Great pyramid of Giza was built 244 years before Noahs' Flood. (2614 BC) (4600 years before 1986 is 2614 BC.)
Awake 1986 1/22nd January pp. 29-30
Watching the World ***What was the air like 4,600 years ago? That is what scientists are hoping to discover when they penetrate an underground chamber on the southwest side of the Great Pyramid of Giza. The 96-foot-long (29 m) chamber, covered by 4- to 6-foot-thick (1.2 to 1.8 m) limestone slabs, is thought to house a second ancient funerary boat for the "soul" of Pharaoh Cheops. The first-only 12 feet (3.7 m) away from the current site-was discovered in 1954. That wooden vessel, 130 feet (40 m) in length and excellently preserved, is on display in a museum built for it. The two pits, some 30 feet (9 m) deep and covered with 10 feet (3 m) of rubble, escaped the ravages of time and tomb robbers. It is expected that the second will be like the first-hermetically sealed by gypsum cement, thus trapping the ancient air. Space-age technology will be used to penetrate the chamber without introducing outside air. This will enable the scientists to measure particularly the carbon dioxide and carbon monoxide in the interior air, compare them with present levels, and perhaps throw some light on the question of whether the earth is really warming up as is believed by some scientists.