man lock

an air lock serving as a decompression chamber for workers. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
man lock
civil engineering an airlock that allows workmen to pass in and out of spaces with differing air pressures, esp one providing access to and from a tunnel, shaft, or caisson in which the air is compressed

Collins English Dictionary - Complete & Unabridged 10th Edition
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