HMS B2

HMS B2 was one of 11 B-class submarines built for the Royal Navy in the first decade of the 20th century.

Design and description
The B class was an enlarged and improved version of the preceding A class. The submarines had a length of 142 ft overall, a beam of 12 ft and a mean draft of 11 ft. They displaced 287 LT on the surface and 316 LT submerged. The B-class submarines had a crew of two officers and thirteen ratings.

For surface running, the boats were powered by a single 16-cylinder 600 bhp Vickers petrol engine that drove one propeller shaft. When submerged the propeller was driven by a 180 hp electric motor. They could reach 12 kn on the surface and 6.5 kn underwater. On the surface, the B class had a range of 1000 nmi at 8.7 kn.

The boats were armed with two 18-inch (450 mm) torpedo tubes in the bow. They could carry a pair of reload torpedoes, but generally did not as they would have to remove an equal weight of fuel in compensation.

Construction and career
B2 was built by Vickers at their Barrow-in-Furness shipyard, launched on 30 October 1905 and completed on 9 December 1905. The boat was lost when she accidentally collided with SS Amerika 4 mi northeast of Dover in the early hours of 4 October 1912. She was commanded by Lieutenant P.B. O’Brien and was one of several submarines sent to Dover to take part in Channel exercises during the extended lead up to the First World War. B2 was surfaced and was struck just forward of the conning tower. The accident resulted in the deaths of 15 crew members. The only survivor was the boat's bridge officer, Lt. Pulleyne. The boat was not recovered in order to allow the bodies to remain undisturbed. In recent years the wreck was discovered by amateur divers.