 At the end of the mission, Yi returned to Earth along with ISS crew members Peggy Whitson and Yuri Malenchenko aboard Soyuz TMA-11, on April 19, 2008.Due to a malfunction with the Soyuz vehicle, the craft followed a ballistic re-entry which subjects the crew to severe gravitational forces up to 10 times the amount experienced on Earth.As a result of the re-entry, the TMA-11 craft used in the return flight landed off-course from its target in Kazakhstan.