But this same submarine managed to do other damage. The American steamship _Nebraskan_ was in the neighborhood on its way to New York. The sea was calm and the ship was traveling at 12 knots, when some time near nine o'clock in the evening a shock was felt aboard. A second later there came a terrific explosion, and a subsequent investigation showed that a large hole, 20 feet square, had been torn in her starboard bow, not far from the water line. When she began to settle the captain ordered all hands into the small boats. They stayed near the damaged ship for an hour and saw that she was not going to sink. When they got aboard again they found that a bulkhead was keeping out the water sufficiently to allow her to proceed under her own steam. In crippled condition she made for port, being convoyed later by two British warships which answered her calls for help. In spite of the sharp diplomatic representations which were at the time passing back and forth between Germany and the United States over the matter of the German submarine warfare, the craft kept up as active a campaign against merchant ships as they did before the issues became pointed. On May 28, 1915, there came the news that three more ships had been sent to the bottom. The _Spennymoor_, a new ship, was chased and torpedoed off Start Point, near the Orkney Islands. Some of her crew were drowned when the lifeboat in which they were getting away capsized, carrying them down. On the same day the large liner _Argyllshire_ was chased and fired upon by the deck guns of a hostile submarine, but she managed to get away. Not so fortunate, however, was the steamship _Cadesby_. While off the Scilly Islands on the afternoon of May 28, 1915, a German submarine hailed her, firing a shot from a deck gun across her bows as a signal to halt. Time was given for the crew and passengers to get into small boats, and when these were at a distance from the ship the deck guns of the submarine were again brought into action, and after firing thirty shots into her hull they sank her. The third victim was the Swedish ship _Roosvall_. She was stopped and boarded off Malmoe by the crew of a German submarine. After examining her papers they permitted her to proceed, but later sent a torpedo into her, sinking her.