At sea, the submarine "E14" made two voyages into the Marmara. The third tour began on 21 July, when "E14" passed through the straits despite a new anti-submarine net placed near the Narrows. The next attempt was made by on 27 July, which was caught in the net, forced to the surface and bombarded by shore batteries; "Mariotte" was scuttled. On 8 August, "E11" torpedoed the battleship "Barbaros Hayreddin" with the loss of and sank a gunboat, seven transports and 23 sailing vessels.