Propeller

A diver scans a 50-ft wooden hull. The propeller is between 4 m and 5 m from the DIDSON. The scan moved toward the bow, then the diver rolled the DIDSON 90° to show the keel.

A diver scans a 50-ft wooden hull. The propeller is between 4 m and 5 m from the DIDSON. The scan moved toward the bow, then the diver rolled the DIDSON 90° to show the keel.
THIS IMAGE WAS CAPTURED BY OR FEATURES A DIDSON