The planned uncrewed second flight of Ptichka was changed in 1991 to the following: December 1991 — Ptichka 1.02 uncrewed second flight, with a duration of 7–8 days. Orbital manoeuvrers and space station approach test: automatic docking with Mir's Kristall module crew transfer from Mir to the shuttle, with testing of some of its systems in the course of twenty-four hours, including the remote manipulator undocking and autonomous flight in orbit docking of the crewed Soyuz TM-101 with Ptichka crew transfer from the Soyuz to the shuttle and onboard work in the course of twenty-four hours automatic undocking and landing Cancellation of the program 1993 After the first flight of a Buran shuttle, the project was suspended due to lack of funds and the political situation in the Soviet Union. The two subsequent orbiters, which were due in 1990 (Orbiter 1.02) and 1992 (Orbiter 2.01) were never completed. The project was officially terminated on 30 June 1993, by President Boris Yeltsin. At the time of its cancellation, 20 billion roubles had been spent on the Buran program. The program was designed to boost national pride, carry out research, and meet technological objectives similar to those of the U.S. Space Shuttle program, including resupply of the Mir space station, which was launched in 1986 and remained in service until 2001. When Mir was finally visited by a spaceplane, the visitor was a Space Shuttle orbiter, not a Buran-class orbiter. The Buran SO, a docking module that was to be used for rendezvous with the Mir space station, was refitted for use with the U.S. Space Shuttles during the Shuttle–Mir missions. The cost of a Buran launch carrying a 20 ton payload was estimated at 270 million roubles, vs 5.5 million roubles on the Proton rocket. Baikonur hangar collapse On 12 May 2002, a hangar roof at the Baikonur Cosmodrome in Kazakhstan collapsed because of a structural failure due to poor maintenance. The collapse killed eight workers and destroyed one of the Buran-class orbiters (Buran 1.01), which flew the test flight in 1988, as well as a mock-up of an Energia booster rocket. It was not clear to outsiders at the time which Buran-class orbiter was destroyed, and the BBC reported that it was just "a model" of the orbiter. It occurred at the MIK RN/MIK 112 building at Site 112 of the Baikonur Cosmodrome, 14 years after the only Buran flight.