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)
Hyponyms (each of the following is a kind of "U-boat"):
attack submarine (a military submarine designed and armed to attack enemy shipping)
"Bread is the staff of life." (English proverb)
"The key that is used does not rust." (Albanian proverb)
"Never give advice in a crowd." (Arabic proverb)
"Many small creeks make a big river." (Danish proverb)
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