Testing the Rescue System. Astronauts test the Simplified Aid for EVA Rescue (SAFER) system some 130 nautical miles from Earth. The pair were actually performing an in-space rehearsal or demonstration of a contingency rescue using the never- before flown hardware. One wears the small back-pack unit with its complementary chest-mounted control unit, and the other is anchored Discovery's Remote Manipulator System robot arm, took turns using the SAFER hardware during their shared space walk of Sept 16, 1994 (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.