Working from a barge, the crew remove an existing sensor from an over the side mounted pole that will be used for the parametric sonar system.
Removing the Existing Sensor
Image courtesy of Paleolandscapes and the ca. 8,000 BP Shoreline of the Gulf of Mexico Outer Continental Shelf. Download larger version (jpg, 5.9 MB).

Working from a barge, the crew remove an existing sensor from an over-the-side mounted pole that will be used for the parametric sonar system.

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