Scene Context: Turbo and Sarah perform a spacewalk to manually unjam the backup relay.
Essence of the Phenomenon: For extravehicular activity (EVA), an astronaut uses not just a pressurized suit, but an entire complex of systems. The xEMU provides pressure and mechanical protection, the PLSS maintains life support, and the SAFER is an emergency maneuvering module designed for self-rescue in the event of untethered separation from the spacecraft.
Scientific Basis: The PLSS (Portable Life Support System) is responsible for oxygen supply, ventilation, thermal regulation, and power for the spacesuit. The SAFER utilizes a small reserve of compressed gas for short impulses to stabilize and correct the astronaut's position in space. It is not a full-fledged transportation jetpack, but an emergency self-rescue system for very short distances.
Current Limitations: The SAFER's delta-v budget is strictly limited. If a significant portion is spent stabilizing a spin, there may not be enough resources left to compensate for linear drift. This is why even a relatively low separation velocity in open space is highly lethal.