On 11 September "Wilk" prepared to attack the German cruiser Admiral Hipper, but the ship made an unexpected course change and the submarine wasn't able to proceed. Later that day, the Polish Naval Command issued an order to all of the submarines to seek British waters. "Wilk" surfaced off the Swedish coast. Three days later it spotted the German destroyer Z4 Richard Beitzen and torpedo boat "T107" in Øresund. Believing "Wilk" to be a Swedish submarine on a neutrality patrol, the German ships didn't take any action. "Wilk" proceeded to withdraw through Kattegat.