• Home
  • About RSIS
    • Introduction
    • Building the Foundations
    • Welcome Message
    • Board of Governors
    • Staff Profiles
      • Executive Deputy Chairman’s Office
      • Dean’s Office
      • Management
      • Distinguished Fellows
      • Faculty and Research
      • Associate Research Fellows, Senior Analysts and Research Analysts
      • Visiting Fellows
      • Adjunct Fellows
      • Administrative Staff
    • Honours and Awards for RSIS Staff and Students
    • RSIS Endowment Fund
    • Endowed Professorships
    • Career Opportunities
    • Getting to RSIS
  • Research
    • Research Centres
      • Centre for Multilateralism Studies (CMS)
      • Centre for Non-Traditional Security Studies (NTS Centre)
      • Centre of Excellence for National Security (CENS)
      • Institute of Defence and Strategic Studies (IDSS)
      • International Centre for Political Violence and Terrorism Research (ICPVTR)
    • Research Programmes
      • National Security Studies Programme (NSSP)
      • Studies in Inter-Religious Relations in Plural Societies (SRP) Programme
    • [email protected] Newsletter
    • Other Research
      • Future Issues And Technology (FIT)
      • Science and Technology Studies Programme (STSP) (2017-2020)
  • Graduate Education
    • Graduate Programmes Office
    • Overview
    • MSc (Asian Studies)
    • MSc (International Political Economy)
    • MSc (International Relations)
    • MSc (Strategic Studies)
    • NTU-Warwick Double Masters Programme
    • PhD Programme
    • Exchange Partners and Programmes
    • How to Apply
    • Financial Assistance
    • Meet the Admissions Team: Information Sessions and other events
    • RSIS Alumni
  • Alumni & Networks
    • Alumni
    • Asia-Pacific Programme for Senior Military Officers (APPSMO)
    • Asia-Pacific Programme for Senior National Security Officers (APPSNO)
    • SRP Executive Programme
    • Terrorism Analyst Training Course (TATC)
  • Publications
    • RSIS Publications
      • Annual Reviews
      • Books
      • Bulletins and Newsletters
      • Commentaries
      • Counter Terrorist Trends and Analyses
      • Commemorative / Event Reports
      • IDSS Paper
      • Interreligious Relations
      • Monographs
      • NTS Insight
      • Policy Reports
      • Working Papers
      • RSIS Publications for the Year
    • Glossary of Abbreviations
    • External Publications
      • Authored Books
      • Journal Articles
      • Edited Books
      • Chapters in Edited Books
      • Policy Reports
      • Working Papers
      • Op-Eds
      • External Publications for the Year
    • Policy-relevant Articles Given RSIS Award
  • Media
    • Cohesive Societies
    • Great Powers
    • Sustainable Security
    • COVID-19 Resources
    • Other Resource Pages
    • Media Highlights
    • News Releases
    • Speeches
    • Vidcast Channel
    • Audio/Video Forums
  • Events
  • Giving
  • Contact Us
Facebook
Twitter
YouTube
RSISVideoCast RSISVideoCast rsis.sg
Linkedin
instagram instagram rsis.sg
RSS
  • Home
  • About RSIS
      • Introduction
      • Building the Foundations
      • Welcome Message
      • Board of Governors
      • Staff Profiles
        • Executive Deputy Chairman’s Office
        • Dean’s Office
        • Management
        • Distinguished Fellows
        • Faculty and Research
        • Associate Research Fellows, Senior Analysts and Research Analysts
        • Visiting Fellows
        • Adjunct Fellows
        • Administrative Staff
      • Honours and Awards for RSIS Staff and Students
      • RSIS Endowment Fund
      • Endowed Professorships
      • Career Opportunities
      • Getting to RSIS
  • Research
      • Research Centres
        • Centre for Multilateralism Studies (CMS)
        • Centre for Non-Traditional Security Studies (NTS Centre)
        • Centre of Excellence for National Security (CENS)
        • Institute of Defence and Strategic Studies (IDSS)
        • International Centre for Political Violence and Terrorism Research (ICPVTR)
      • Research Programmes
        • National Security Studies Programme (NSSP)
        • Studies in Inter-Religious Relations in Plural Societies (SRP) Programme
      • [email protected] Newsletter
      • Other Research
        • Future Issues And Technology (FIT)
        • Science and Technology Studies Programme (STSP) (2017-2020)
  • Graduate Education
      • Graduate Programmes Office
      • Overview
      • MSc (Asian Studies)
      • MSc (International Political Economy)
      • MSc (International Relations)
      • MSc (Strategic Studies)
      • NTU-Warwick Double Masters Programme
      • PhD Programme
      • Exchange Partners and Programmes
      • How to Apply
      • Financial Assistance
      • Meet the Admissions Team: Information Sessions and other events
      • RSIS Alumni
  • Alumni & Networks
      • Alumni
      • Asia-Pacific Programme for Senior Military Officers (APPSMO)
      • Asia-Pacific Programme for Senior National Security Officers (APPSNO)
      • SRP Executive Programme
      • Terrorism Analyst Training Course (TATC)
  • Publications
      • RSIS Publications
        • Annual Reviews
        • Books
        • Bulletins and Newsletters
        • Commentaries
        • Counter Terrorist Trends and Analyses
        • Commemorative / Event Reports
        • IDSS Paper
        • Interreligious Relations
        • Monographs
        • NTS Insight
        • Policy Reports
        • Working Papers
        • RSIS Publications for the Year
      • Glossary of Abbreviations
      • External Publications
        • Authored Books
        • Journal Articles
        • Edited Books
        • Chapters in Edited Books
        • Policy Reports
        • Working Papers
        • Op-Eds
        • External Publications for the Year
      • Policy-relevant Articles Given RSIS Award
  • Media
      • Cohesive Societies
      • Great Powers
      • Sustainable Security
      • COVID-19 Resources
      • Other Resource Pages
      • Media Highlights
      • News Releases
      • Speeches
      • Vidcast Channel
      • Audio/Video Forums
  • Events
  • Giving
  • Contact Us
  • instagram instagram rsis.sg
Connect

Getting to RSIS

Map

Address

Nanyang Technological University
Block S4, Level B3,
50 Nanyang Avenue,
Singapore 639798

View location on Google maps Click here for directions to RSIS

Get in Touch

    Connect with Us

      rsis.ntu
      rsis_ntu
      rsisntu
    RSISVideoCast RSISVideoCast rsisvideocast
      school/rsis-ntu
    instagram instagram rsis.sg
      RSS
    Subscribe to RSIS Publications
    Subscribe to RSIS Events

    RSIS Intranet

    S. Rajaratnam School of International Studies Think Tank and Graduate School Ponder The Improbable Since 1966
    Nanyang Technological University Nanyang Technological University

    Skip to content

     
    • RSIS
    • Publication
    • RSIS Publications
    • CO10057 | Sinking of the Cheonan: Rethinking Littoral Warfare
    • Annual Reviews
    • Books
    • Bulletins and Newsletters
    • Commentaries
    • Counter Terrorist Trends and Analyses
    • Commemorative / Event Reports
    • IDSS Paper
    • Interreligious Relations
    • Monographs
    • NTS Insight
    • Policy Reports
    • Working Papers
    • RSIS Publications for the Year

    CO10057 | Sinking of the Cheonan: Rethinking Littoral Warfare
    Ong Wei Chong

    31 May 2010

    download pdf
    RSIS Commentary is a platform to provide timely and, where appropriate, policy-relevant commentary and analysis of topical and contemporary issues. The authors’ views are their own and do not represent the official position of the S. Rajaratnam School of International Studies (RSIS), NTU. These commentaries may be reproduced with prior permission from RSIS and due credit to the author(s) and RSIS. Please email to Editor RSIS Commentary at [email protected].

    Commentary

    The sinking of the Cheonan is a timely reminder on the complexities of littoral warfare. A serious rethink about asymmetric threats from the littoral zone is required for an adequate response.

    THE RELEASE of the Investigation Result on the Sinking of ROKS Cheonan established beyond reasonable doubt that a CHT-02D acoustic/wake homing torpedo of North Korean manufacture was responsible for the sinking of the 1200 tonne Corvette. The multinational Joint Civilian-Military Investigation Group (JIG) assessed: “The evidence points overwhelmingly to the conclusion that the torpedo was fired by a North Korean submarine.”

    The North Korean Navy’s (NKN) emphasis on the development of its littoral expertise resulted in the successful torpedo attack and sinking of the Cheonan, a Pohang class Anti-submarine Warfare (ASW) Corvette armed with fairly modern hull-mounted sonar, Mk-46 mod 2 light torpedoes and Mk-9 depth charge racks. The evidence suggests that the successful attack had been carried out by a NKN midget submarine – considered to be of an obsolete design by Western standards.

    In short, it would seem that a low-tech enemy submarine and its subsequent torpedo launch went undetected by a fairly sophisticated ASW Corvette in familiar coastal shallows. The question that network-centric navies should be asking is — have they thought and done enough about the threat posed by ultra-quiet diesel submarines that fight asymmetrically in littoral waters?

    The Midget Asymmetric Threat

    The North Korean submarine fleet comprises approximately 20 Romeo class submarines (1,800 tonnes), 40 Sango class midget submarines (300 tonnes) and 10 Yeono class midget submarines (130 tonnes). These low-tech diesel-electric submarines of 1950/60s vintage constitute the backbone of the asymmetric NKN – particularly the Sango and the Yeono class midget submarines. Rather than a head-on beyond the horizon encounter with the technologically superior South Korean Navy, the NKN has built a special naval force around its midget submarines well-versed in the art of mine-laying, harbour infiltration and other forms of littoral warfare.

    Such an asymmetric littoral-focused approach is not unique to North Korea. Iran too has a fleet of Ghadir and Nahang class midget submarines that might be more capable than the NKN’s Sango and Yeono class. The missile and torpedo equipped midget submarines of the Iranian Navy have the potential to wreck significant damage on any expeditionary fleet operating in the crowded and noisy coastal confines of the Persian Gulf.

    Compared to the vast open oceanic deep where under-sea detection is relatively easy, trying to detect a midget submarine in the sonically diverse environment of the littoral shallows can be akin to locating a Mozart-lover in the midst of a death-metal rock concert. In short, the littoral shallows, particular unfamiliar coastal waters constitute the most daunting environment for ASW operators.

    Decline in Littoral Capabilities: A Cause for Concern

    In 2005, an electric-diesel submarine, HMS Gotland was leased from the Royal Swedish Navy to evaluate the effectiveness of the US Navy’s (USN) ASW capabilities. The Gotland was able to ‘sink’ the Nimitz class carrier USS Ronald Reagan in the open waters of the Pacific which in turn raised serious concerns about the USN’s ASW capabilities. If US surface fleets are so vulnerable in the blue open of the Pacific, what then in the unknown murky brown confines of coastal waters.

    In recognition of the undersea threat to its carrier strike groups, expeditionary strike groups and strategic sealift assets in forward operating areas, the USN has since poured in significant resources to the littoral environment including the development of the P-8 Poseidon Multi-mission Maritime Aircraft (MMA) as a replacement for the venerable P-3 Orion. Even so, no ASW systems, tactics and concepts of non Cold War origin have entered US service since the collapse of the Soviet Union – particularly any serious (re)conceptualisation of ASW in the littoral zone.

    When the P-8 does enter service in 2013, its onboard magnetic analogy and hydro-carbon detectors together with its ability to provide continuous maritime surveillance in conjunction with the Broad Area Maritime Surveillance (BAMS) UAV will represent a significant technological and capability leap from the 50 year old P-3. That in itself however does not mean that the USN or any of its partner navies will get any better in combating the asymmetric littoral threat. A rethink of what the littoral is and the willingness to see it as a unique system rather than an extension of what a blue-water navy does is long overdue.

    Continued Relevance of the Littoral to the RSN

    In its journey from First Generation to Third, the Republic of Singapore Navy (RSN) has built a well- balanced fleet with significant blue (open) and brown (coastal) water capabilities. In the contemporary maritime security environment, the greater challenges for the RSN will lie in the littorals – particularly asymmetric threats to ship-to-shore operations. As such, the RSN would do well to maintain and further develop its Mine Countermeasures (MCM), Protection of Instillation (POI), coastal surveillance and intelligence, Command and Control (C2) of joint operations in the littoral and ASW capabilities.

    Despite a life extension programme, the RSN will have to consider replacing its twenty year-old Victory class Missile Corvettes within the decade. Rather than dedicated surface combatants, a possible replacement could be multi-mission command and support ships such as the Absalon class of the Royal Danish Navy (RDN). Through the use of mission modules, such ships have the flexibility of serving as C2 platforms, MCM vessels, amphibious assault ships and hospital ships in littoral zones.

    In the maritime security environment of the 21st century, the US and its strategic partners will find themselves increasingly crossing the blue only to get to the littoral. The sinking of the Cheonan by a 1950-era midget submarine in familiar coastal shallows should have by now roused the carrier-barons from their clear blue slumber. Midget submarines and littoral combat are not sexy buzzwords of the month – they are deadly reflections of a new strategic reality.

    About the Author

    Ong Weichong is Associate Research Fellow with the S. Rajaratnam School of International Studies (RSIS), Nanyang Technological University. He is attached to the Military Transformations Programme at the school’s constituent unit, the Institute of Defence and Strategic Studies. He is also a Doctoral Candidate with the Centre for the Study of War, State and Society, University of Exeter, UK. 

    Categories: Commentaries / General / International Politics and Security / East Asia and Asia Pacific

    Last updated on 10/10/2014

    RSIS Commentary is a platform to provide timely and, where appropriate, policy-relevant commentary and analysis of topical and contemporary issues. The authors’ views are their own and do not represent the official position of the S. Rajaratnam School of International Studies (RSIS), NTU. These commentaries may be reproduced with prior permission from RSIS and due credit to the author(s) and RSIS. Please email to Editor RSIS Commentary at [email protected].

    Commentary

    The sinking of the Cheonan is a timely reminder on the complexities of littoral warfare. A serious rethink about asymmetric threats from the littoral zone is required for an adequate response.

    THE RELEASE of the Investigation Result on the Sinking of ROKS Cheonan established beyond reasonable doubt that a CHT-02D acoustic/wake homing torpedo of North Korean manufacture was responsible for the sinking of the 1200 tonne Corvette. The multinational Joint Civilian-Military Investigation Group (JIG) assessed: “The evidence points overwhelmingly to the conclusion that the torpedo was fired by a North Korean submarine.”

    The North Korean Navy’s (NKN) emphasis on the development of its littoral expertise resulted in the successful torpedo attack and sinking of the Cheonan, a Pohang class Anti-submarine Warfare (ASW) Corvette armed with fairly modern hull-mounted sonar, Mk-46 mod 2 light torpedoes and Mk-9 depth charge racks. The evidence suggests that the successful attack had been carried out by a NKN midget submarine – considered to be of an obsolete design by Western standards.

    In short, it would seem that a low-tech enemy submarine and its subsequent torpedo launch went undetected by a fairly sophisticated ASW Corvette in familiar coastal shallows. The question that network-centric navies should be asking is — have they thought and done enough about the threat posed by ultra-quiet diesel submarines that fight asymmetrically in littoral waters?

    The Midget Asymmetric Threat

    The North Korean submarine fleet comprises approximately 20 Romeo class submarines (1,800 tonnes), 40 Sango class midget submarines (300 tonnes) and 10 Yeono class midget submarines (130 tonnes). These low-tech diesel-electric submarines of 1950/60s vintage constitute the backbone of the asymmetric NKN – particularly the Sango and the Yeono class midget submarines. Rather than a head-on beyond the horizon encounter with the technologically superior South Korean Navy, the NKN has built a special naval force around its midget submarines well-versed in the art of mine-laying, harbour infiltration and other forms of littoral warfare.

    Such an asymmetric littoral-focused approach is not unique to North Korea. Iran too has a fleet of Ghadir and Nahang class midget submarines that might be more capable than the NKN’s Sango and Yeono class. The missile and torpedo equipped midget submarines of the Iranian Navy have the potential to wreck significant damage on any expeditionary fleet operating in the crowded and noisy coastal confines of the Persian Gulf.

    Compared to the vast open oceanic deep where under-sea detection is relatively easy, trying to detect a midget submarine in the sonically diverse environment of the littoral shallows can be akin to locating a Mozart-lover in the midst of a death-metal rock concert. In short, the littoral shallows, particular unfamiliar coastal waters constitute the most daunting environment for ASW operators.

    Decline in Littoral Capabilities: A Cause for Concern

    In 2005, an electric-diesel submarine, HMS Gotland was leased from the Royal Swedish Navy to evaluate the effectiveness of the US Navy’s (USN) ASW capabilities. The Gotland was able to ‘sink’ the Nimitz class carrier USS Ronald Reagan in the open waters of the Pacific which in turn raised serious concerns about the USN’s ASW capabilities. If US surface fleets are so vulnerable in the blue open of the Pacific, what then in the unknown murky brown confines of coastal waters.

    In recognition of the undersea threat to its carrier strike groups, expeditionary strike groups and strategic sealift assets in forward operating areas, the USN has since poured in significant resources to the littoral environment including the development of the P-8 Poseidon Multi-mission Maritime Aircraft (MMA) as a replacement for the venerable P-3 Orion. Even so, no ASW systems, tactics and concepts of non Cold War origin have entered US service since the collapse of the Soviet Union – particularly any serious (re)conceptualisation of ASW in the littoral zone.

    When the P-8 does enter service in 2013, its onboard magnetic analogy and hydro-carbon detectors together with its ability to provide continuous maritime surveillance in conjunction with the Broad Area Maritime Surveillance (BAMS) UAV will represent a significant technological and capability leap from the 50 year old P-3. That in itself however does not mean that the USN or any of its partner navies will get any better in combating the asymmetric littoral threat. A rethink of what the littoral is and the willingness to see it as a unique system rather than an extension of what a blue-water navy does is long overdue.

    Continued Relevance of the Littoral to the RSN

    In its journey from First Generation to Third, the Republic of Singapore Navy (RSN) has built a well- balanced fleet with significant blue (open) and brown (coastal) water capabilities. In the contemporary maritime security environment, the greater challenges for the RSN will lie in the littorals – particularly asymmetric threats to ship-to-shore operations. As such, the RSN would do well to maintain and further develop its Mine Countermeasures (MCM), Protection of Instillation (POI), coastal surveillance and intelligence, Command and Control (C2) of joint operations in the littoral and ASW capabilities.

    Despite a life extension programme, the RSN will have to consider replacing its twenty year-old Victory class Missile Corvettes within the decade. Rather than dedicated surface combatants, a possible replacement could be multi-mission command and support ships such as the Absalon class of the Royal Danish Navy (RDN). Through the use of mission modules, such ships have the flexibility of serving as C2 platforms, MCM vessels, amphibious assault ships and hospital ships in littoral zones.

    In the maritime security environment of the 21st century, the US and its strategic partners will find themselves increasingly crossing the blue only to get to the littoral. The sinking of the Cheonan by a 1950-era midget submarine in familiar coastal shallows should have by now roused the carrier-barons from their clear blue slumber. Midget submarines and littoral combat are not sexy buzzwords of the month – they are deadly reflections of a new strategic reality.

    About the Author

    Ong Weichong is Associate Research Fellow with the S. Rajaratnam School of International Studies (RSIS), Nanyang Technological University. He is attached to the Military Transformations Programme at the school’s constituent unit, the Institute of Defence and Strategic Studies. He is also a Doctoral Candidate with the Centre for the Study of War, State and Society, University of Exeter, UK. 

    Categories: Commentaries / General / International Politics and Security

    Last updated on 10/10/2014

    Back to top

    Terms of Use | Privacy Statement
    Copyright © S. Rajaratnam School of International Studies. All rights reserved.
    This site uses cookies to offer you a better browsing experience. By continuing, you are agreeing to the use of cookies on your device as described in our privacy policy. Learn more
    OK
    Latest Book
    CO10057 | Sinking of the Cheonan: Rethinking Littoral Warfare

    Commentary

    The sinking of the ...
    more info