on february 1 , 1990 , during a spacewalk , alexander serebrov keynes an experimental flying chairs that had been brought to soyuz with kvant 2 . unlike u . s . astronauts , who began untethered balloons with a different device , the soviet cosmonaut remains attached to the iss with a steel vibrating , since there is no nasa shuttle to pick him up in case of an emergency .
US shuttle Atlantis docks with the Mir space station.