_Rosetta_ then spoke the smack _Noel_, which had been close to her during the action, and now confirmed all her observations. Skipper Novo had no doubt that the U-boat had been the obstruction which was tangled in his net. She had carried it all away, and to get clear had been obliged to come to the surface without knowing where she might find herself. As to her fate, there was no reasonable doubt. But since neither debris nor survivors were seen, the case, with rigid scrupulosity, was refused a place among the certainties. The enemy are no better off for that. The story of two trawlers, _Lark II_ and _Lysander III_, will show how much difference luck may make in giving or withholding the evidence necessary to prove a complete success. These two boats were included in a small division patrolling off the Cornish coast, and hunted two submarines with apparent success, one in March and one in April, but obtained the maximum award on the first occasion only. The third ship of the division was then the drifter _Speculation_, and the division commander was Chief Skipper Donald McMillan, R.N.R. He was in a certain position close inshore on March 10, listening with hydrophones for a U-boat which was known to be on the prowl, when he sighted a steamer about four miles away in the act of being blown up. He made for her with all speed, but she sank in four minutes; twenty-one of her crew of twenty-five were found still floating in one small boat and a raft. The Chief Skipper ‘interrogated’ the poor men, and found that the ship was a Spanish steamer, the _Christina_. Then he put them on board _Speculation_, and ordered her to take them at once into St. Ives, while _Lark_ and _Lysander_ carried out their hydrophone work as before.