LOL! Gerard Butler Takes ‘Extra’s’ Submarine Pop Quiz

“Extra’s” AJ Calloway sat down with Gerard Butler as he promoted new film “Hunter Killer.”

In the movie, Butler plays a submarine captain, but how well does he know the lingo?

Gerard took a submarine slang pop quiz that "Extra" cooked up. See how he did!

To prep for the role, he spent three days in a submarine.

“Hunter Killer” hits theaters October 26.

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