The Train — Iceberg Grounding
The NOAA playback is speeded up ×16.
Record status: A quasi-steady 32–35 Hz signal recorded in March 1997. NOAA considers a very large iceberg grounding and dragging its keel on the seafloor the most likely mechanism.
What NOAA says
The arrival azimuth points toward the Ross Sea near Cape Adare. The sound is interpreted as the acoustic result of a large grounded iceberg moving slowly and scraping the seafloor.
Archive logic
The name “The Train” survives as a historical nickname. The page now separates that memorable label from the present physical interpretation.
Record parameters
| Recorded | 4 March 1997 |
| Frequency | Approx. 32–35 Hz |
| Likely region | Ross Sea / Cape Adare |
| Classification | Large grounded iceberg |