sentences:  The patrol was uneventful, and the boat returned to Lerwick, Scotland, on 6 January.On 2 February 1944, "Syrtis" departed Kames Bay with the X-class midget submarine "X22" in tow.Five days later, while nearing Scapa Flow, "Syrtis"s watch officer was washed overboard; the submarine turned to pick him up, but collided with "X22", which went down with all hands.