u-boat

1. A submersible warship usually armed with torpedoes (synset 104354832)
   is a type of: submersible, submersible warship - a warship designed to operate under water
   subtypes:

   • attack submarine - a military submarine designed and armed to attack enemy shipping
   • auxiliary research submarine - a submarine for research purposes
   • fleet ballistic missile submarine - a submarine carrying ballistic missiles
   • nautilus, nuclear submarine, nuclear-powered submarine - a submarine that is propelled by nuclear power
   has:

   • conning tower - a raised bridge on a submarine; often used for entering and exiting
   • escape hatch - hatchway that provides a means of escape in an emergency
   • periscope - an optical instrument that provides a view of an otherwise obstructed field
   • breather, schnorchel, schnorkel, snorkel, snorkel breather - air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
   • asdic, echo sounder, sonar - a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
   same as: pigboat, sub, submarine

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