van Haren, H.; Laan, M; Asjes, S.; Denissen, B. (2020). Deep Caller for Ocean Acoustic Releases. J. Atmos. Oceanic. Technol. 37(6): 1135-1137. https://doi.org/10.1175/jtech-d-20-0025.1
In: Journal of Atmospheric and Oceanic Technology. American Meteorological Society: Boston, MA. ISSN 0739-0572; e-ISSN 1520-0426, meer
We relate about the custom-made modification of a Benthos deep-ocean acousticrelease into a ‘deep caller’, a hydrophone for calling ocean acoustic releases that cannotbe reached from a standard deck-unit. The self-contained deep caller can be lowereddown to 12 km on any non-conducting winch cable. It may prove useful to retrieve subsurface instrumentation like a seafloor-lander hidden behind large rocks or in a narrowcanyon, or moorings in very deep topographic depressions. We used it to retrieve a 7km long mooring from 10,910 m depth in the Challenger Deep, Mariana Trench.
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