Object 640 "Black Eagle"

Object 640, also known as “Black Eagle,” was a tank design shrouded in secrecy. Mockups were revealed at two separate demonstrations in 1997 and 1999, but were shown far away from spectators. What people saw were prototypes with a low profile, a large turret, and a hull similar to that of the T-80U. According to reports, both prototypes mounted a 125mm smoothbore gun, but the design could have accommodated a 152mm main gun. However, no version of the Black Eagle went into production; the engineering firm behind the tank declared bankruptcy in 2002.