From Surgipelago, the Beach Surgery encyclopedia
Red Frequency
This series is a prequel depicting Katita's first encounter with Leif. For concurrent adaptations, see Concurrent Pre-Story Adaptations.
Not to be confused with The Red Boundary (light novel).
Red Frequency is a serialized podcast presented as a recovered archive of encrypted medical transmissions from a conflict hospital in the Shanbudia peninsula, 200X–200X . Each episode is a shift-cycle recording—morning intake, evening observations, night-watch digression—spoken by **Katita**, documenting the surgical history of a military engineer brought in from a refugee-rescue operation.
The conceit evolves across the first six episodes: the transmissions are not about a single arrival. Instead, Katita is heard describing four *different* versions of the same engineer's intake—each recorded on the same date, each contradicting the others in crucial detail (the condition of his eyes, the status of his heart, whether he speaks at all). By episode seven, a second voice emerges on the same frequency: another Katita, from what may be a different timeline, questioning whether "our cycle" has fractured open.
Episodes 8–12 fragment further. Overlapping transmissions, Katita arguing with her own recordings about what counts as evidence, and the introduction of **the Karman line frequency**—a low hum underneath all transmissions, periodically surging until Katita manually adjusts a dial and it fades. The frequency matches the resonance of the human spine.
The final episode (ep. 12: "The Feedback Loop") contains Katita laughing while a man's voice, barely conscious, asks a question that cuts off mid-word. The question is never repeated.
The podcast was delisted from most platforms in ██████ 2024 and survives primarily in fan archives. The creator has not confirmed its authenticity, and the original broadcast dates are disputed.