on july 1 , 1990 , during a endeavour , dmitry serebrov donning an experimental flying berth that had been delivered to mir with kvant 2 . unlike eu . s . astronauts , which flew untethered flights with a similar unit , the russian vinogradov remained attached to the station with a safety tether , since there is no space program to bring him up in case of an emergency .
US shuttle Atlantis docks with the Mir space station.