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Place of originGermany
Service history
In service2004
Used byGermany, Israel, Pakistan, Spain, Turkey, Colombia
Production history
DesignerAtlas Elektronik
Length6.6 m (22 ft)
Warhead weight260 kg
Proximity or contact detonation

EngineElectrical silver-zinc oxide batteries
Speed50 knots
Wire-guided with autonomous active terminal homing sonar

DM2A4 Seehecht (export designation "SeaHake mod 4" [1]) is the latest heavyweight torpedo developed by Atlas Elektronik for the German Navy, as a further update of DM2 (Deutsches Modell 2) torpedo which was released in 1976.


Being the successor of the DM2A3, it features an advanced electrical propulsion system and a fiber optic cable for torpedo guidance and communication, which, in conjunction with advanced signals processing and mission logic, makes the torpedo largely countermeasure resistant.[2] The DM2A4/SeaHake mod 4 is the first torpedo ever to be guided by a fiber optic wire.[3] With a fully digital system architecture, increased range and speed and its new conformal array sonar with a very wide panoramic sensor angle as well as the additional wake homing sensor, the DM2A4/SeaHake mod 4 provides greatly advanced performance over its predecessor. The homing head shell is a hydrodynamic optimised parabolic shape which aims to reduce torpedo self-noise and cavitation to an absolute minimum. The homing head's conformal transducer array permits detection angles of +/-100° in the horizontal and +/-24° in the vertical, therefore supporting larger acquisition angles in comparison to traditional flat arrays. The wide angle array is designed to reduce maneuvering when in search and reconnaissance stages, therefore also reducing self-noise and preserving battery power.

The weapon has a modular design that includes up to four silver zinc battery modules and is able to achieve a range of more than 50 km (27 nmi) and a speed exceeding 92.6 km/h (50 kn) powered by a high frequency permanent magnet motor, with a closed-loop cooling system independent from the environment. Exact performance data are classified.[4] The torpedo design template may also be used as the basis for ROV.[5] The weapon is armed with a 260 kg PBX, (RDXaluminium) warhead (equivalent to 460 kg of TNT) with magnetic influence and contact fuzes.[5] The charge and fuse are insensitive and electromagnetic pulse safe.

The weapon has a length of 6.6 m when configured with 4 battery modules, and is respectively shorter when configured with either 3 or 2 battery modules depending upon the requirement of the operating unit. Diameter of the unit is 533 mm.

Service history[edit]

The torpedo is in service with the German Navy Type 212 submarines, has been delivered to the Pakistan Navy for service in the Agosta 90B submarines, has been selected by the Spanish Navy for its new S80A submarines and has been sold to other operators worldwide.[6][7][8]


The SeaHake Mod 4 torpedo, in service with seven countries and with over 300 torpedoes in 2015[9] having been delivered :

See also[edit]


  1. ^ "" (PDF).
  2. ^ DiGiulian, Tony. "World War II Torpedoes of Germany - NavWeaps".
  3. ^ "Todays Torpedoes [Archive] - SUBSIM® Radio Room Forums".
  4. ^ "Defense & Security Intelligence & Analysis: IHS Jane's - IHS".
  5. ^ a b DiGiulian, Tony. "World War II Torpedoes of Germany - NavWeaps".
  6. ^ "Uboot-Torpedos" (in German). German Navy. 23 June 2016. Retrieved 10 March 2017.
  7. ^ "ATLAS Elektronik GmbH at IDEAS 2014 in Karachi". Naval Forces. 28 November 2014. Retrieved 10 March 2017.
  8. ^ Cordesman, Anthony H.; Nerguizian, Aram; Popescu, Inout C. (2008). Israel and Syria: The Military Balance and Prospects of War. Praeger Security International. p. 127. ISBN 978-0313355202.
  9. ^ Luca Peruzzi (2015). "Big hitters: heavyweight torpedoes follow an incremental course" (PDF). Jane's 360. Retrieved 28 May 2017..
  10. ^ (11 December 2010). "El Gobierno aplaza un año la adquisición de torpedos por los retrasos que acumula el S-80 - Noticias Infodefensa España".
  11. ^ results, search; Nerguizian, Aram; Popescu, Inout C. (30 July 2008). Israel and Syria: The Military Balance and Prospects of War. Praeger. ISBN 978-0313355202.

External links[edit]