#submersible  an apparatus intended for use under water
  supertype:  apparatus.equipment__apparatu__setup  equipment designed to serve a specific function
  subtype:  bathyscaphe__bathyscaph__bathyscape  navigable deep diving vessel for underwater exploration
  subtype:  bathysphere  spherical deep diving apparatus (lowered by a cable) for underwater exploration
  subtype:  diving_bell  diving apparatus for underwater work; has an open bottom and is supplied with compressed air
  subtype:  minisub__minisubmarine  submersible vessel for one or two persons; for naval operations or underwater exploration

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