Q: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
CO CDR Tom Chandler: Only one thing I hate more than seeing a submarine on sonar .
XO Mike Slattery: What 's that ?
CO CDR Tom Chandler: * Not * seeing _ one _ .
A:
submarine