On April 25, A.E. 2 went successfully up and entered the Sea of Marmora; on the 29th, Lieut.-Commander Edward Courtney Boyle followed in E. 14. He started at 1.40 A.M., and the searchlight at Suan Dere was still working when he arrived there at 4 o’clock. The fort fired, and he dived, passing clean under the minefield. He then passed Chanak on the surface with all the forts firing at him. Further on there were a lot of small ships patrolling, and a torpedo gunboat at which he promptly took a shot. The torpedo got her on the quarter and threw up a column of water as high as her mast. But Lieut.-Commander Boyle could not stop to see more--he became aware that the men in a small steamboat were leaning over and trying to catch hold of the top of his periscope. He dipped and left them; then rounded Nagara Point and dived deep. Again and again he came up and was driven down; destroyers and gunboats were chasing and firing in all directions. It was all he could do to charge his batteries at night. After running continuously for over fifty hours, the motors were so hot that he was obliged to stop. The steadiness of all on board may be judged from the record of the diving necessary to avoid destruction. Out of the first sixty-four hours of the voyage, the boat was kept under for forty-four hours and fifty minutes. On the afternoon of the 29th, he sighted three destroyers convoying two troopships; fired and dipped--for the destroyers were blazing at his periscope, and he had only that one left--the other had stopped a shot the day before. But even down below a thud was audible, and the depth gauges flicked ten feet; half an hour afterwards he saw through the periscope his own particular transport making for the shore with dense columns of yellow smoke pouring from her. And that was her last appearance. A few hours later he sighted A.E. 2 and spoke her. She had sunk one gunboat, but had had bad luck with her other torpedoes and had only one left. Lieut.-Commander Boyle arranged to meet her again next day; but next day the gallant A.E. 2 fell to a Turkish gunboat. During these days the Sea of Marmora was glassy calm, and the patrol ships were so troublesome that Lieut.-Commander Boyle decided to sink one as a deterrent. He picked off a small mine-laying boat, and fired at a larger one twice without success, as the wake of the torpedoes was too easily seen in the clear water.