Fired stern torpedo. Target angle 90°, distance 750 meters. Running time 57 seconds. A very heavy detonation, strong, dark black smoke plume. Hit bridge. The steamer sinks immediately. As the smoke from the detonation cleared, only the masts were still visible above the water, and shortly thereafter sank. Water depth of 45 meters. I depart at maximum speed eastwards because the day is dawning and I need some more water under our keel during the day.