M3

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M3

Built By:	Armstrong Whitworth (Tyne)
Build Group:	M
Fate:	Sold for scrapping in February 1932.

M3 while she still had her gun

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Started life as K20.

In 1927 M2 and M3 had their large 12-inch guns removed in the late 1920s to conform with the Washington Disarmament Treaty, which stated that no submarine should have larger than 8-inch calibre guns.

M3 was converted to an experimental minelayer, stowing her 100 mines on rails inside a large free-flooding casing outside the hull. The mines were laid over her stern by means of a chain-conveyor belt. M3 was finally taken out of service in April 1932, and scrapped in 1933.

Events

04-12-1916	Laid Down

19-10-1918	Launched

09-07-1920	Completed

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Length overall	295 ft 9 inch
Beam	24 ft 8 inch
Depth	18 ft 8 inch
Displacement	1594 tons (surface)
	1946 tons (submerged)
Diving Depth	200 ft
Speed	Surface 16 knots (design) 10 (service)
	Submerged 10 (design) 8 to 9 knots (service)
No. of shafts	2
Propeller	3 blades, 5 ft 10 inch diameter
Armament	(i) 4 x 18 inch bow tubes (8 torpedoes carried)
	1 x 12 inch gun
	1 x 3 inch gun
Endurance	Surface: 2500 miles at 16 knots (design) 2000 miles at full power or 4500 miles max (service) / Submerged: 10 miles at 10 knots (design) 9 miles at 8+ knots (service)
Complement	64
Note	(i) In M3 these were replaced by four 21 inch bow tubes, which were responsible for an overall increase in length of 10 ft

Sea Scout (P253)
HMS Sea Scout first commissioned 1944, here shown about 1961 with modern sonar and pennant number. A modernised group 3 S Class painted black with snort. This would likely be the appearance of the 8 S Class recorded as in service in 1958. The last Sea Devil went out of service in 1966
Class:	1935 - 1970: Improved S Class
Built By:	Cammell Laird (Mersey)
Build Group:	S3
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Class:	1930 - 1946: Grampus Class
Built By:	Vickers (Barrow)
Build Group:	G2
Fate:
Possibly sunk off Penang by Japanese A/S aircraft on or about 11th January 1945. On 3rd January 1945 the Submarine left Trincomalee in Ceylon (now Sri Lanka) for her 23rd War Patrol (4th in the Far East) with orders to lay a minefield off Penang. On 9th Jan 1945, Lt. Cdr. H B Turner, DSC is understood to have reported by signal that he had successfully laid her mines off Penang. On 13th January 1945, HMS Stygian was sent a signal informing her that Porpoise was in trouble 17 miles northwest of Pulo Perak). This information came from an Ultra decrypt (now in the National Archives in London) reporting that on 11th January a Nakajima B6N2 bomber had attacked a Submarine, dropping two 60kg bombs. Further bombing attacks we made later but there was no further contact. Japanese records show that a submarine was spotted and bombed by aircraft in the vicinity of Penang. Although not destroyed in this attack, the submarine was wounded and leaking oil that left a trail for the Japanese anti-submarine forces to follow as they closed in for the kill. HMS Porpoise was later declared overdue and then as �lost with all hands�.

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M3

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