In the early 1980s, the Navy developed instrumentation to quantify the geoacoustic properties of the upper 500 m to 1 km of marine sediments in water depths to 6000 m. To obtain this information with the resolution required to support Navy systems (several meters in depth and a few tens of meters along track), a system operating from the sea surface could not be used. Thus, a new system was needed that operated below the surface.

The initial development of such a system (now known as the deep towed acoustics/geophysics system, or DTAGS) was carried out at the Naval Ocean...

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