Read the text and determine if the sentence is true (see options at the end):

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.

Sentence: The astronauts remained firmly attached to base
Options are:
 (1). Yes.
 (2). It's impossible to say.
 (3). No.