Simplified Aid For EVA Rescue

Simplified Aid For EVA Rescue (SAFER) is a small, self-contained, propulsive backpack system (jet pack) worn during spacewalks, to be used in case of emergency. If an astronaut were to lose physical contact with their spacecraft during untethered walk, the backpack can provide free-flying movement to facilitate return. It is worn on spacewalks outside the International Space Station (ISS) and was worn on spacewalks outside the Space Shuttle. So far, there has not been an emergency in which it was needed. SAFER is a small, simplified version of the Manned Maneuvering Unit (MMU), which was used for regular maneuvering.