Log Entry September 47, 2243:
Signal anomaly detected from Sector Δ-15Z. Initial readings suggest complex harmonic structures modulating across quantum frequencies. Possible artificial origin. Guidance systems fail to pinpoint source, reminiscent of 21st-century oceanic murmurs.
Report from Deep-Space Recon:
+ Transmission encrypted; decryption pending +
+ Artifacts resemble rudimentary sonar devices utilized by early marine research fleets +
Echoes interpolate with cosmic background noise; signature arcs suggest potential loop anomaly.
Final Assessment:
Further analysis required. Query mystery: Are we receivers of an ancient digital song, uninterrupted across the ages? Or interstellar echoes from civilizations yet unfathomed?