on october 1 , 1990 , during a spacewalk , alexander serebrov dons an independent flying armchair that had been delivered to mir with kvant 2 . unlike u . s . astronauts , having entered untethered , with a comparable device , the soviet gagarin remains connected to the station with a security harnesses , since there is no space cruiser to take him up in case of an emergency .
US shuttle Atlantis docks with the Mir space station.