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Ron Comer, Scripps’ resident technician, and Rob Palomares (right) attach a “pinger” to the DSL-120 depressor clump. The clump weight is attached to the same cable that tethers the DSL-120 to the ship. Most of the effects of the ship’s pitch and roll at the surface are dampened by the clump weight, giving the DSL-120 a more stable ride as it flies 100 meters above the seafloor. The pinger that Rob is holding send out a pulse of sound that bounces off the bottom to tell us how far the clump weight is above the seafloor.

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