EML Kalev was one of two submarines of the Republic of Estonia launched in 1936 at Vickers and Armstrongs Ltd. in England. Her sister, Lembit, survived the Second World War.

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EML Kalev
History
Estonia
Name	Kalev
Operator	Estonian Navy
Ordered	12 December 1934
Builder	Vickers and Armstrongs Ltd., United Kingdom
Laid down	May 1935
Launched	7 July 1936 13:20
Commissioned	12 March 1937
In service	1937–1940
Out of service	1940
Homeport	Tallinn
Nickname(s)	Kalev
Captured	by USSR in 1940
Soviet Union
Name	Kalev
Operator	Soviet Navy
In service	1940 - 1941
Out of service	1941
Homeport	Tallinn, Leningrad
Captured	from Estonia in 1940
Fate	missing after 29 October 1941
General characteristics
Class and type	Kalev-class submarine
Displacement	665 tons surfaced 853 tons submerged
Length	59.5 m (195 ft 3 in)
Beam	7.5 m (25 ft) 7.5 m (24 ft 7 in)
Draught	3.6 m (12 ft) 3.6 m (11 ft 10 in)
Propulsion	two diesel Vickers and Armstrongs Ltd. (1,200 hp (890 kW; 1,200 PS))[clarification needed] two Metropolitan-Vickers electric motors (790 hp (590 kW; 800 PS))[clarification needed]
Speed	surfaced - 13.5 kn (15.5 mph; 25.0 km/h) submerged - 8.5 kn (9.8 mph; 15.7 km/h)
Test depth	120 m (390 ft)
Complement	4 officers + 28 sailors
Armament	4 × 21 inch (533 mm) torpedo tubes (bow, 8 torpedoes) 1 × 40 mm Bofors AA gun 1 × 7.7 mm Lewis AA machine gun 24 mines

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Kalev was a second pre-war Estonian Navy submarine. Estonia is a maritime nation and, like every country with a long coastline, had to defend its territorial waters. Based on the experiences of World War I, the submarines found their proper application in the pre-Second World War Estonian Navy. The collection organised by the Submarine Fleet Foundation in May 1933 developed into one of the most successful undertakings among similar events nationwide.

In the course of building and testing two submarines, the Estonian crews got a top-level naval training at the time in England in 1935–1937. In the period of 1937–1940 the submarines Lembit and Kalev were the most imposing naval vessels of the Estonian Navy. Their non-interference upon the annexation of Estonia by the USSR was a political decision made irrespective of the will of the navy.^[1]

The submarine Kalev joined the Estonian Navy in spring 1937, where she operated until the Soviet takeover in 1940. (On 24 February 1940, The Third Reich had expressed its interest in obtaining the submarine, if Estonia would sell it, but this offer was turned down.)

Kalev's ultimate fate or the location of the wreck was unknown for a long time. It was generally assumed that she hit a mine and sunk off Keri in the Gulf of Finland between Tallinn and Helsinki, but she could have been anywhere between Kronstadt and Hanko; some sources suggested she was scuttled in the Tallinn Bay during the Soviet evacuation on 28 August 1941.

In June 2010, an Estonian Maritime Museum research team concentrated their efforts on finding Kalev. It was assumed that Kalev hit a mine and sank in a minefield laid off Cape Juminda.^[3] On 30 June 2010 a wreck of what appeared to be a submarine was found five miles north of Cape Juminda, Northern Estonia by the Estonian Maritime Museum research vessel Mare. According to marine archeologist Vello Mäss, the specific shape of shafts for laying mines on the submarine-shaped object seen on the sonar screen gave rise to hopes indicating a probability of about 95% that the wreck found was the Kalev. However, further research had to be done to conclusively confirm the finding.^[4]

Hopes were high that this sonar target suggested that Kalev had been found and that the presumption that she sank as a result of hitting a mine near Cape Juminda was correct.^[4]

Later it was discovered that despite the wreck looking like a submarine, it turned out to be an old aerostat. Kalev is still missing.