| Built By: | Pembroke Dockyard |
| Build Group: | H21 |
| Fate: | Sold to the Breakers June 1924 |
| 01-10-1917 | Laid Down |
| 15-11-1918 | Launched |
| 01-09-1919 | Completed |
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| Length overall | 171 ft 9 inch |
| Beam | 15 ft 9 inch |
| Depth | 15 ft 4 inch |
| Displacement | 438 tons (surface) |
| 504 tons (submerged) | |
| Diving Depth | 150 ft |
| Speed | Surface 13 knots (design) |
| Surface 11.5 knots (service) | |
| Submerged 10 to 10.5 knots (design) | |
| Submerged 9 knots (service) | |
| No. of shafts | 2 |
| Armament | 4 x 21 inch bow tubes (6 torpedoes carried) |
| Endurance | Surface: 2000 miles at full power (design) |
| Surface: 1100 miles at full power or 1600 miles at 10 knots (service) | |
| Submerged: 70 miles at 3 knots (design) | |
| Submerged: 9 miles at 8 knots or 34 miles at 3.5 knots (service) | |
| Complement | 22 |
Bill's prime Cause Celebre has resulted in his being included in the Guinness Book of Records as having made the deepest unaided ascent from a sunken submarine. He has other claims worthy of recognition, he was among those officers and men who trained many of the crews who joined the Twelfth Submarine Flotilla during WW2. This Flotilla consisted of X Craft and Two Man Chariots. It was based at Port Bannantyne on the Isle of Bute. The HQ was known as HMS Varbel.
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