Four M-class submarines replaced the order for the last four K-class submarines, K17-K21. Although they were similar in size, the M class was an entirely different design from the K class, although it is possible that some material ordered for the K-boats went into them. In any event, the end of the First World War meant that only three were completed. M2 was laid down at Vickers shipyard at Barrow in Furness in 1916, and launched in 1919. Like the other members of her class, she was armed with a single fixed 12-inch gun as well as torpedo tubes. The Mark IX gun was taken from spares held for the Formidable-class battleships. seaplane. The M-class submarines were very large for the time at long. They were designed to operate as submarinemonitors or cruisers. They displaced on the surface and when submerged. Two 12-cylinder diesel engines producing drove them on the surface; underwater, they were driven by electric motors producing. After the accidental sinking of in 1925, M2 and her sister were taken out of service and reassigned for experimental use. Her 12-inch gun was removed, replaced by a small aircraft hangar, the work being completed in 1927. This could carry a small Parnall Peto seaplane, specially designed for the M2, which, once its wings had been unfolded, could be lowered onto the sea alongside by a derrick for take off. On landing, the aircraft was hoisted back onto the deck and replaced into the hangar. In October 1928, a hydraulicaircraft catapult was fitted, to enable the seaplane to take off directly from the deck. The submarine was intended to operate ahead of the battle fleet in a reconnaissance role, flying off her unarmed seaplane as a scout. The concept of a submarine cruiser was pursued with, but was not a success and was later abandoned.
Accident
M2 left her base at Portland on 26 January 1932, for an exercise in West Bay, Dorset, carrying Parnall Peto serial N255. Her last communication was a radio message at 10:11 to her submarine depot ship,, to announce that she would dive at 10:30. The captain of a passing merchant ship, the NewcastlecoasterTynesider, mentioned that he had seen a large submarine dive stern first at around 11:15. Unaware of the significance of this, he only reported it in passing once he reached port. Her entire crew of 60 was killed in the accident. The submarine was found on 3 February, eight days after her loss. Ernest Cox, the salvage expert who had raised the German battleships at Scapa Flow, was hired to salvage the M2. In an operation lasting nearly a year and 1,500 dives, on 8 December 1932, she was lifted to within of the surface before a gale sprang up, sending her down to her final resting place. The hangar door was found open and the aircraft still in it. The accident was believed to be due to water entering the submarine through the hangar door, which had been opened to launch the aircraft shortly after surfacing. Two explanations have been advanced. The first is that since the crew were always trying to beat their record time for launching the aircraft, they had opened the hangar door on surfacing while the deck was still awash. The other theory is that the flooding of the hangar was due to failure of the stern hydroplanes. High pressure air tanks were used to bring the boat to the surface in an awash condition, but to conserve compressed air compressors were then started to completely clear the ballast tanks of water by blowing air into them. This could take as long as 15 minutes to complete. The normal procedure for launching the aircraft was therefore to hold the boat on the surface using the hydroplanes whilst the hangar door was opened and the aircraft launched. Failure of the stern hydroplanes would have sent the stern down as observed by the merchant officers and water would have eventually entered the hangar.
Aftermath
The submarine currently lies upright on the sea bed at. Her keel is about below the surface at low tide, and her highest point at the top of the conning tower at around. She is a popular dive for scuba divers. The wreck is designated as a "protected place" under the Protection of Military Remains Act 1986. After the loss of M2, the Royal Navy abandoned submarine-launched aircraft, although other navies experimented with the concept in the inter-war years and with Japan producing some 42 submarine aircraft carriers both before and during the Second World War.
