HMS L12 was at sea with an Officer Training Class; at the same time H47 was on independent exercises in the Irish Sea. At 0800 both submarines were off the Pembrokeshire coast with L12 ahead of H47. L12 suddenly altered course to starboard. H47 at once went full astern and to collision stations. The two submarines crashed together with L21 bow penetrating about 2 feet. In only 15 seconds H47 began to sink. L12 also began to take in water but her crew managed to control the flood.
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Boat Classes
Boats In Class
H21 Specification
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)
HMS Stratagem sailed from Trincomalee on 10th November 1944 with orders to patrol in the vicinity of Malacca where it was believed the Japanese were loading ships with bauxite ore.
On the afternoon of the 18th Stratagem attacked and sank the tanker Nichinan Maru.
On 22nd November a Japanese aircraft spotted the submarine and directed a destroyer to where it had dived. Just after midday the destroyer attacked, the first depth charge causing the submarine's bow to strike the bottom.
The submarine was plunged into darkness and the forward part began to flood. Attempts to shut the watertight door to the forward compartment failed and the crew were forced to make their escape.
Ten crew managed to escape, of which eight were taken Prisoner of War. Only three of these (who were taken to Japan) survived captivity. The other five were executed in Singapore by the Japanese.
World War Two thriller starring John Mills. While out on routine patrol, the Royal Navy submarine Trojan accidentally strikes an electronically-operated drifting mine, and plunges immediately to the sea bed. As time and air start to run out, the Captain, Lt Cmdr Armstrong (Mills) gathers the handful of survivors together and tries to figure out the best means of escape.