moon pool

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moon pool

n
(Mining & Quarrying) (in the oil industry) an open shaft in the centre of the hull of a ship engaged in deep-sea drilling through which drilling takes place
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014