In April of 1912, the cargo-passenger liner SS Mesaba radioed an ice warning to RMS Titanic. The message was received but never made it to the bridge.
The supposedly unsinkable Titanic then hit an iceberg and sank on her maiden voyage, with the loss of 1,500 lives. Mesaba herself was sunk, by a torpedo in World War I in 1918.
Now, the BBC reports that Bangor University researchers, using state-of-the art multibeam sonar, have been able to identify the Mesaba‘s wreck and pinpoint her final resting place.