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{{Short description|US naval surveillance vessel}}
{{Other ships|USS Impeccable}}
{{Use dmy dates|date=July 2014}}
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|Hide header=
|Ship flag={{USN flag}}
|Ship name=
|Ship namesake=
|Ship country=U.S.
|Ship owner=[[United States Navy]]
|Ship operator=[[Military Sealift Command]]
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'''USNS ''Impeccable'' (T-AGOS-23)''' is an [[Impeccable
==Construction==
''Impeccable'' was built by [[American Shipbuilding]], [[Tampa, Florida]]. The contract was awarded on 28 March 1991. The ship's keel was laid down on 15 March 1992, but the Tampa shipyards went bankrupt by November 1993.<ref>{{cite news |url=https://www.nytimes.com/1993/11/05/business/company-news-american-ship-seeks-bankruptcy-protection.html |title=American Ship Seeks Bankruptcy Protection |date=5 November 1993 |newspaper=[[The New York Times]] |
==Design==
The ship is a designated [[T-AGOS]] vessel built to tow a [[Surveillance Towed Array Sensor System]]. The ship's [[catamaran]]-type [[small waterplane area twin hull]] (SWATH) design prevents the vessel from rolling in heavy seas and gives additional deck space for storing the acoustic equipment.<ref>{{cite web |url=https://www.globalsecurity.org/military/systems/ship/tagos-23.htm |title=T-AGOS-23 Impeccable |website=GlobalSecurity.org |
==Mission==
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===Low Frequency Active Sonar===
{{Main|Surveillance Towed Array Sensor System}}
*The SURTASS [[Low Frequency Active Sonar]] system, onboard ''Impeccable'', commenced sea trials in late February 2004. During the spring and summer of 2004, ''Impeccable'' conducted five training missions in the Philippine Sea and the northwest Pacific Ocean. All LFA sonar operations included the operation of the ''High Frequency / Marine Mammal Mitigation'' sonar and compliance with all mitigation requirements.<ref>{{cite journal |url=https://www.govinfo.gov/content/pkg/FR-2005-08-25/html/05-16938.htm |title=Taking Marine Mammals Incidental to Navy Operations of Surveillance Towed Array Sensor System Low Frequency Active Sonar |journal=[[Federal Register]] |date=25 August 2005 |volume=70 |number=164 |pages=49914–49915 |
* Total operational days on board
:(15 August 2003 to 15 August 2004) 26.2 days with 63.0 hours of transmissions
:(15 August 2004 to 15 August 2005) 9.4 days with 22.7 hours of transmissions
:(15 August 2005 to 15 August 2006) 22.5 days with 39.4 hours of transmissions.<ref>{{cite web |url=http://www.nmfs.noaa.gov/pr/pdfs/permits/surtass_lfa_final_report.pdf |title=Final Comprehensive Report for the Operation of the Surveillance Towed Array Sensor System Low Frequency Active (SURTASS LFA) |author=Department of the Navy, Chief of Naval Operations |date=January 2007 |website=NOAA |
*The ship had five years of active and passive operations in the Western Pacific before the incident in the South China Sea.
===South China Sea incidents===
[[File:USNS Impeccable–SCSea incident02.jpg|thumb|left|Two Chinese trawlers stop directly in front of
On 5 March 2009,
On 7 March, a Chinese intelligence ship contacted
[[File:USNS Impeccable 090308-N-0000X-004.jpg|left|thumb|One Chinese crewmen waves a Chinese flag, while another uses a grappling hook to try to snag ''Impeccable'
On 8 March 2009,
[[File:Paracel 88.png|thumb|right|The [[Hainan Submarine Base]] is on the island of Hainan. The nearby [[Paracel Islands]] are administered by China, but claimed by both Vietnam and Taiwan]]
The United States lodged formal protests following the incident, stating that under international law, the U.S. military can conduct activities "in waters beyond the territorial sea of another state without prior notification or consent" including in an [[exclusive economic zone]] of another country. "The unprofessional maneuvers by Chinese vessels violated the requirement under international law to operate with due regard for the rights and safety of other lawful users of the ocean."<ref name="WP0309"/><ref name="REUTERS">{{cite web |url=https://www.reuters.com/article/politicsNews/idUSTRE52845A20090309 |title=U.S. says Chinese vessels harassed Navy ship |last=Morgan |first=David |date=9 March 2009 |website=[[Reuters]] |access-date=16 February 2019}}</ref> China's Foreign Ministry responded that the Pentagon's complaints that five Chinese vessels had harassed
On 12 March 2009, U.S. President [[Barack Obama]] gave the go-ahead to send the [[guided missile destroyer]] {{USS|Chung-Hoon|
[[Hans M. Kristensen]] of the [[Federation of American Scientists]] has suggested that the incident may be related to the classified [[Type 093 submarine]] that the Chinese navy had recently deployed in the area.<ref>{{cite web |url=http://www.fas.org/blog/ssp/2009/03/incident.php |title=US-Chinese Anti-Submarine Cat and Mouse Game in South China Sea |first=Hans M. |last=Kristensen |date=9 March 2009 |website=Federation of American Scientists |
====Views on the legality of US and Chinese actions during these incidents====
[[File:USNS Impeccable T-AGOS-23 port forward view.jpg|thumb|''Impeccable'' in 2009]]
The United States maintains that the Convention, which it has signed, but not yet ratified, authorizes activities such as those undertaken by ''Impeccable''.<ref name="China hits out at US on navy row">{{cite web |url=http://news.bbc.co.uk/2/hi/asia-pacific/7934138.stm |title=China hits out at US on navy row |date=10 March 2009 |website=[[BBC News]] |access-date=16 February 2019}}</ref><ref name="jane">{{cite web |url=http://news.sky.com/skynews/Home/World-News/US-And-China-Face-Off-In-South-China-Sea-USNS-Impeccable-And-Chinese-Boats/Article/200903215238151?lpos=World_News_First_World_News_Article_Teaser_Region_1&lid=ARTICLE_15238151_US_And_China_Face-Off_In_South_China_Sea%2C_USNS_Impeccable_And_Chinese_Boats |title=US and China Face Off in South China Sea |date=9 March 2009 |website=[[Sky News]] |access-date=10 March 2009 |archive-url=https://web.archive.org/web/20090312233323/http://news.sky.com/skynews/Home/World-News/US-And-China-Face-Off-In-South-China-Sea-USNS-Impeccable-And-Chinese-Boats/Article/200903215238151?lpos=World_News_First_World_News_Article_Teaser_Region_1&lid=ARTICLE_15238151_US_And_China_Face-Off_In_South_China_Sea%2C_USNS_Impeccable_And_Chinese_Boats |archive-date=12 March 2009 |
▲The United States maintains that the Convention, which it has signed, but not yet ratified, authorizes activities such as those undertaken by ''Impeccable''.<ref name="China hits out at US on navy row">{{cite web |url=http://news.bbc.co.uk/2/hi/asia-pacific/7934138.stm |title=China hits out at US on navy row |date=10 March 2009 |website=[[BBC News]] |access-date=16 February 2019}}</ref><ref name="jane">{{cite web |url=http://news.sky.com/skynews/Home/World-News/US-And-China-Face-Off-In-South-China-Sea-USNS-Impeccable-And-Chinese-Boats/Article/200903215238151?lpos=World_News_First_World_News_Article_Teaser_Region_1&lid=ARTICLE_15238151_US_And_China_Face-Off_In_South_China_Sea%2C_USNS_Impeccable_And_Chinese_Boats |title=US and China Face Off in South China Sea |date=9 March 2009 |website=[[Sky News]] |access-date=10 March 2009 |archive-url=https://web.archive.org/web/20090312233323/http://news.sky.com/skynews/Home/World-News/US-And-China-Face-Off-In-South-China-Sea-USNS-Impeccable-And-Chinese-Boats/Article/200903215238151?lpos=World_News_First_World_News_Article_Teaser_Region_1&lid=ARTICLE_15238151_US_And_China_Face-Off_In_South_China_Sea%2C_USNS_Impeccable_And_Chinese_Boats |archive-date=12 March 2009 |dead-url=yes |df=dmy-all }}</ref><ref>{{cite web |url=http://news.bbc.co.uk/1/hi/world/asia-pacific/7933171.stm |title=Chinese ships 'harass' US vessel |date=9 March 2009 |website=[[BBC News]] |access-date=16 February 2019}}</ref> Several legal experts also state that there is no legal foundation for China's claim that it can prevent foreign naval vessels from operating within its Exclusive Economic Zone. For example, Raul Pedrozo, writing in the ''Chinese Journal of International Law'', concludes that "all nations may legitimately engage in military activities in foreign exclusive economic zones, without prior notice to, or consent of, the coastal State concerned."<ref>{{cite web |url=http://www.mcclatchydc.com/251/story/63656.html |title=Why did China choose now to surround a U.S. warship? |first=Tim |last=Johnson |date=10 March 2009 |website=[[McClatchyDC]] |accessdate=11 March 2009 |deadurl=yes |archiveurl=https://web.archive.org/web/20090313045527/http://www.mcclatchydc.com/251/story/63656.html |archivedate=13 March 2009}}</ref><ref>{{cite journal |url=https://papers.ssrn.com/abstract=1565306 |title=Preserving Navigational Rights and Freedoms: The Right to Conduct Military Activities in China's Exclusive Economic Zone |first=Raul (Pete) |last=Pedrozo |date=1 March 2010 |journal=Chinese Journal of International Law |volume=9 |issue=1 |pages=9-29 |via=[[SSRN]] |accessdate=16 February 2019}}</ref> On the contrary, Chinese officials assert that the operations are illegal. Rear Admiral [[Wang Dengping]], political commissar of the Armament Department of the [[Chinese Navy]], condemned the ''Impeccable's'' activities, stating that "Innocent passage by naval vessels from other countries in the [[Territorial waters]] in the [[Special Economic Zone]] is acceptable, but not allowed otherwise"<ref>{{cite web |url=http://news.xinhuanet.com/english/2009-03/10/content_10985038.htm |title=Navy lawmaker: Violation of China's sovereignty not allowed |date=10 March 2009 |website=Xinhua News Agency |accessdate=7 December 2010 |deadurl=yes |archiveurl=https://web.archive.org/web/20121107064608/http://news.xinhuanet.com/english/2009-03/10/content_10985038.htm |archivedate=7 November 2012}}</ref> under the Convention. Chinese actions were further defended by Professor Ji Guoxing of [[Shanghai Jiao Tong University]] who, writing in ''China Security'', maintained that under the Convention, navigation rights in coastal countries' exclusive economic zones are "subject to the resource-related and environment-related laws and regulations of the coastal state," and China could exclude the ''Impeccable'' on this basis. Ji further asserted that the Convention's prohibition against gathering military intelligence in another country's territorial waters should be interpreted to also prohibit intelligence gathering in coastal countries' exclusive economic zones.<ref>{{cite journal |url=http://www.chinasecurity.us/pdfs/jiguoxing.pdf |title=The Legality of the 'Impeccable Incident' |author=Ji Guoxing |journal=China Security |volume=5 |number=2 |date=Spring 2009 |accessdate=14 September 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20120327211055/http://www.chinasecurity.us/pdfs/jiguoxing.pdf |archivedate=27 March 2012}}</ref>
==2015 rescue at sea==
On July 19, 2015 while en route for a scheduled port visit to [[Subic Bay]], USNS ''Impeccable'' (T-AGOS 23) rescued 11 fishermen. ''Impeccable'' sailors spotted personnel on a partially submerged ship and noted debris in the water. "They [''Impeccable'' crew] initially spotted only eight people on the partially submerged vessel," said Lt. Cory Hilgart, the theater anti-submarine watch officer at Commander, Task Force 74. "They then realized that it was actually 11 and made the call to commence the rescue effort."
==See also==
* [[Code for Unplanned Encounters at Sea]]
* [[Hainan Island incident]]
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* [[Territorial waters]]
* [[United Nations Convention on the Law of the Sea]]
*
*
==References==
{{Reflist}}
{{
==External links==
{{Commons category}}
* {{navsource|09/66/6623|USNS Impeccable (T-AGOS-23)}}
* [http://www.msc.navy.mil/pm2/ Special Mission Program] {{Webarchive|url=https://web.archive.org/web/20080913184005/http://www.msc.navy.mil/PM2/ |date=13 September 2008 }}
* [https://www.globalsecurity.org/military/systems/ship/tagos-23.htm T-AGOS 23 Impeccable] at GlobalSecurity.org
{{Impeccable-class ocean surveillance ship}}
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