Slow Down — Iceberg Grounding
The NOAA playback is speeded up ×16.
Record status: A seven-minute descending-frequency signal recorded in May 1997. NOAA considers a large iceberg grounding near the Antarctic Peninsula highly probable.
What the network measured
The event was strong enough to be detected on three sensors nearly 5,000 km away. NOAA places the origin near 62°S, 60°W and explains the descending frequency as the drifting iceberg slowing after contacting the seafloor.
Archive logic
Slow Down is useful precisely because the mystery weakened. It shows how a strange signal can migrate from anomaly to physical mechanism when geometry, repeated examples, and later observations accumulate.
Record parameters
| Recorded | 19 May 1997 |
| Approx. source | 62°S, 60°W |
| Range | Nearly 5,000 km |
| Classification | Highly probable iceberg grounding |