[2] For surface running, the boats were powered by two 600-brake-horsepower (447 kW) diesels, each driving one propeller shaft.

On the surface, the D class had a range of 2,500 nautical miles (4,600 km; 2,900 mi) at 10 knots (19 km/h; 12 mph).

[2] D6 was laid down on 24 February 1910 by Vickers at their Barrow shipyard, launched 23 October 1911 and was commissioned on 19 April 1912.

There were only two survivors who were taken prisoner;[3] one of whom was F. S. Bell, the second-in-command who would go on to command HMS Exeter at the Battle of the River Plate.

The post-war report apparently led the British to conclude that the torpedo that sank her had employed a magnetic pistol.