#submersible_warship__submersiblewarship__submersible  a warship designed to operate under water
  exclusion:  #surface_ship
  supertype:  #warship__war_vessel__warvessel__combat_ship  a government ship that is available for waging war
  subtype:  #pigboat__submarine__sub__uboat  a submersible warship usually armed with torpedoes
     subtype:  #attack_submarine  a military submarine designed and armed to attack enemy shipping
     subtype:  #auxiliary_research_submarine  a submarine for research purposes
     subtype:  #fleet_ballistic_missile_submarine__fleetballisticmissilesubmarine  a submarine carrying ballistic missiles
     subtype:  #nautilus__nuclear_submarine__nuclearsubmarine__nuclear-powered_submarine__nuclearpoweredsubmarine  a submarine that is propelled by nuclear power

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