Scene Context: Sarah manually disables the transmission of her bio-data and GPS beacon, leaving Mission Control and the crew without a telemetry window into her condition.
Essence of the Phenomenon: Technically, this does not mean the "disappearance of a person," but a forced closure of a portion of the outgoing data channel by the user or the spacesuit's onboard logic.
Scientific Basis: In modern spacesuit architectures, telemetry, biomedical data, and navigation beacons are treated as separate information subsystems. This makes it fundamentally possible to prioritize them, disable them locally, or restrict transmission in more complex future systems.
Theoretical Extrapolation: This scenario assumes that the spacesuit allows the astronaut to manually disable the transmission of bio-data and the beacon independently of the core life support systems. This does not contradict the developmental logic of telemetry systems; rather, this specific capability is an element of an advanced engineering model.