Acoustically monitored bottom coring

Abstract

An adaptation of the sound pinger designed by Edgerton to position an underwater camera for bottom photography has been used to monitor bottom coring operations with a Stetson corer. It is found that the pinger portrays the whole procedure in considerable detail, including the triggering of the corer for free-fall at the bottom. Cores have been taken successfully in water depths of 1912 and 2635 fathoms in the Ionian Sea.