"He breaks the surface."

Translation: ghor ghor ghaH.

[RexSettle]

Another example where the answer on the comment page is correct Klingon BUT all suggested answers had the first letter of the sentence/phrase capitalized which for "ghor" is a spelling error

[jdmcowan]

Yep. That's one of the known issues: https://forum.duolingo.com/comment/26778885