On February 1, 1990, during a spacewalk, Alexander Serebrov dons an experimental flying armchair that had been delivered to Mir with Kvant 2. Unlike U.S. astronauts, who flew untethered flights with a similar device, the Soviet cosmonaut remains attached to the station with a safety tether, since there is no space shuttle to pick him up in case of an emergency.
The astronauts remained firmly attached to base
( z1 remain :ARG1 ( z2 astronaut ) :ARG3 ( z3 attach :ARG1 z2 :ARG2 ( z4 base ) :ARG1-of ( z5 firm ) ) )