ˌɔn sˈɛvəntˌiːn dᵻsˈɛmbɚ, ʃiː ɐtˈækt ænd klˈeɪmd sˈɪŋkɪŋ ɐn ˌʌnaɪdˈɛntᵻfˌaɪd sˈʌbmɚɹˌiːn, bˌʌt ðə ɹᵻpˈoːɹt ɹᵻmˈeɪnz ʌŋkənfˈɜːmd.
On 17 December, she attacked and claimed sinking an unidentified submarine, but the report remains unconfirmed.