WWII naval threat Crossword Clue

Today's (11 February 2019) crossword provided to us by L.A. Times Daily and the clue is "WWII naval threat".
The right answer or rather the best answer for the "WWII naval threat" is:

Best Answer UBOAT

Crossword Date: 11 February 2019

Note: The L.A. Times Daily clue "WWII naval threat" has multiple solutions for the given crossword puzzle. We apologize for the confusion, especially if there are other solutions to this crossword.
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