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![This submarine valley was discovered by the U map00080.jpg This submarine valley was discovered by the U](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_map00080.jpg?itok=lnLCHq8S)
Description
This submarine valley was discovered by the U.S. Coast and Geodetic Surveyduring survey operations using acoustic sounding systems coupled with thenewly developed Radio Acoustic Ranging (RAR) navigation system allowingrelatively accurate navigation without having to rely on either visualastronomic positioning or visual ties to objects on land. (Image credit: NOAA Central Library Historical Collection)