Interested in underwater acoustic recordings?
Here is a primer for those willing to handle an hydrophone and a recorder.

Detect, record and then?
While waiting for a widely accepted standard reporting, here is a document with underwater noise levels described.

Final report of a Greenpeace winter survey in 2004.
We were on-board, on the R/V Esperanza, installing a pair of towed array of hydrophones and related acoustic analysis equipment.

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