Estimating Fishing and Diving Use at Gray’s Reef by Listening to Boats | Gray’s Reef National Marine Sanctuary https://graysreef.noaa.gov/news/2021/estimating-fishing-diving-use-by-listening-to-boats.html
Situated 19 miles due east of Sapelo Island, Georgia, the sanctuary can only be accessed by boat. As part of SanctSound, a project co-led by NOAA and the U.S. Navy, our science divers have deployed stationary recorders, known as hydrophones, on the ocean floor in three locations within Gray’s Reef.
In order to see sound, researchers use spectrograms