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bathyscaph, bathyscaphe, bathyscape
a submersible vessel having a flotation compartment with an observation capsule underneath, capable of reaching ocean depths of over 10 000 metres (about 5000 fathoms)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A free, crewed vehicle having a spherical cabin on the underside for exploring the deep ocean.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.