INS Arihant

Short description: Indian nuclear powered submarine

INS Arihant

Script error: The function "infobox_ship_career" does not exist.

General characteristics
Class and type:|  Script error: The function "sclass" does not exist. ballistic missile submarine
Displacement:|  Surface: 6,000 tonne (estimated) [1]
Length:|  111 m (364 ft)[2]
Beam:|  15 m (49 ft)[2]
Draft:|  11 m (36 ft)[2]
Propulsion:|

* 1 x CLWR-B1 Compact Light-water reactor[3][4]
83 MW[2]
* one turbine; one shaft; one 7-bladed, high-skew propeller (estimated)

Speed:|

* Submerged: 24 knots (44 km/h; 28 mph)[5]
* Surfaced: 15 knots (28 km/h; 17 mph)

Range:|  unlimited except by food supplies
Test depth:|  350 m (1,150 ft) (estimated)[6]
Complement:|  95–100 officers and men
Sensors and
processing systems:|

* DRDO USHUS sonar
* DRDO Panchendriya unified submarine sonar, control system and underwater communication system [5]

Armament:|

* 6 × 533 mm (21 in) torpedo tubes - estd. 30 charges (torpedoes, missiles or mines)
* 4 VLS cells for
* 12 × K-15 Sagarika SLBM (or)
* 4 × K-4 SLBM
* [7]

INS Arihant (SSBN 80) (lit. Conqueror), is the lead ship of India's Script error: The function "sclass" does not exist. of nuclear-powered ballistic missile submarines. It is designated S2 Strategic Strike Nuclear Submarine. The 6,000 tonne vessel was built under the Advanced Technology Vessel (ATV) project at the Ship Building Centre in the port city of Visakhapatnam.[8][9]

Arihant was launched on 26 July 2009, the anniversary of Vijay Diwas (Kargil War Victory Day) by Prime Minister Manmohan Singh. After fitting out and extensive sea trials, on 23 February 2016, she was confirmed as ready for operations,[10][11] commissioned in August 2016,[12][13] and deployed operationally in 2018.

## Contents

* 1 Design
* 1.1 Armament
* 2 Development phases
* 3 Launch
* 4 Trials and commissioning
* 5 Operational history
* 5.1 2017 accident allegations and fabrication
* 5.2 First deterrence patrol
* 5.3 User training launch
* 6 See also
* 7 References
* 8 External links

## Design

INS Arihant is the first of the planned five in the class of submarines designed and constructed as a part of the Indian Navy's secretive Advanced Technology Vessel (ATV) project. The ATV project was set up in 1984, under Vice Admiral Mihir K. Roy as the first Director General. The Script error: The function "sclass" does not exist. submarines are reported to be based on the Soviet design based Script error: The function "sclass" does not exist..[14] Their crew were to have the opportunity to train on INS Chakra, an Akula-class submarine, which the Indian Navy leased from Russia.[15][16] Arihant is intended to be more of "a technology demonstrator" than a fully operational SSBN according to Admiral Nirmal Verma.[17]

The vessel is powered by an 83 MW pressurised light-water reactor[18] with enriched uranium fuel.[19] A land-based prototype of the reactor was first built at Kalpakkam and made operational in September 2006. Successful operation for three years yielded the data that enabled the production version for Arihant.[20][21] It was reported that an 80 MW nuclear reactor was integrated into the hull of the ATV in January 2008.[22]

The hull for the vessel was built by L&T's Hazira shipbuilding facility. Tata Power Strategic Engineering Division (SED) built the control systems for the submarine. The systems for the steam turbine integrated with the reactor were supplied by Walchandnagar Industries.[23] Consultancy was provided by Russia.[24] Russia was also reported to have provided assistance to Bhabha Atomic Research Centre (BARC) scientists in miniaturising the reactor to fit into the hull of the nuclear submarine[25]

### Armament

Conceptual drawing of INS Arihant

Arihant has four vertical launch tubes, which can carry 12 (three per launch tube) smaller K-15 missiles or four larger K-4 missiles. The K-4 has a longer range of 3,500 km (2,200 mi), and had commenced trials in 2014.[26][27][28]

## Development phases

A nuclear scientist familiar with the project, on the condition of anonymity, echoed this report in response to media reports that India had successfully launched a completed nuclear submarine.[29] It was also expected that building the reactor, integration of systems, and sea trials would take three to five years.[30]

Admiral Verma told reporters on 7 August 2012 that sea trials of Arihant were commencing in coming months, and she was steadily progressing towards operationalisation.[31] On 27 January 2013, Sagarika, the primary armament of Arihant, completed its final developmental test and was later integrated with the submarine.[32] On 10 August 2013, the nuclear reactor of the submarine went critical[18] this after several months of system checks using shore-based high-pressure steam.[18][33] The reactor's power was raised in increments of 5 to 10% until it reached full power.

## Launch

INS Arihant was introduced to the public on 26 July 2009 at a symbolic launch ceremony by Prime Minister Manmohan Singh's wife Gursharan Kaur.[34] The launch coincided with the 10th anniversary of the conclusion of the Kargil War.[35] The vessel was floated by flooding the dry dock. Gursharan Kaur cracked a coconut on the hull to mark the launch of the submarine, a naval tradition, at the secret naval base in Visakhapatnam.[36] Photography was prohibited and photos showing the complete vessel were not available.[37][38] In his address to the crowd, Prime Minister Singh billed the submarine as an outcome of a public-private partnership. He also thanked Russia in his address.[39] The launch of Arihant strengthened India's endeavour to build a credible nuclear triad – the capability to fire nuclear weapons from air, land and sea.

## Trials and commissioning

K-15 Sagarika SLBM

On 13 December 2014, Arihant sailed north along the Bay of Bengal coast for its extensive sea trials.[40] The sea trials included the firing of the indigenous submarine-launched Sagarika ballistic missile.[41]

On 25 November 2015, an unarmed Sagarika missile was successfully test-fired from Arihant.[42] The submarine then underwent further extensive sea trials, which were completed by early February 2016. Though it had initially been expected Arihant would be commissioned in time to participate in the International Fleet Review 2016, her participation was subsequently ruled out due to security concerns. On 23 February, Arihant was officially confirmed as ready for operations.[11]

According to The Economic Times, several weapons trials of INS Arihant were undertaken secretly.[43]

In August 2016, Prime Minister Narendra Modi commissioned INS Arihant into the Indian Navy.[12][44] Commissioning and arming Arihant completed India's nuclear triad.[45]

## Operational history

PM Modi addressing the crew of Arihant after its first patrol

### 2017 accident allegations and fabrication

In January 2018 it was alleged that an aft hatch on the submarine was left open by mistake while the Arihant was docked in 2017, leading to saltwater flooding the propulsion compartment, rendering the submarine inoperative for ten months while corroding pipes were replaced.[46][47][48][49] These allegations were dismissed by some sources due to the submarine being based on a double hull design[50] as well as claims that it does not have a hatch to the propulsion compartment. However, the Indian Ministry for Defence refused to deny the allegations, claiming it would be a breach of national security to speak on the matter.[51][52] Later media reports alleged of inconsistency of the original report by The Hindu, as per latest investigation the submarine has no hatches. The Arihant is based on Soviet double hull design with a sealed nuclear reactor section.[53]

### First deterrence patrol

It was announced on 5 November 2018 that INS Arihant had completed its first 20-day long deterrent patrol the previous day.[54][55] PM Narendra Modi congratulated the crew of Arihant after the patrol.[56]

### User training launch

To prove crew competency and validate the SSBN programme, INS Arihant on 14 October 2022 successfully launched an SLBM with a predetermined range and hit the target area in the Bay of Bengal with high accuracy.[57] As per a defence source quoted by The Hindu, the missile launched was not the K-4 SLBM but the older K-15 SLBM. At present INS Arihant is armed with K-15 Sagarika SLBM, which possess a range of 750 km.[58]

## See also

* Script error: The function "ship_prefix_templates" does not exist., second submarine in Arihant class
* List of active Indian Navy ships
* Script error: The function "ship_prefix_templates" does not exist., home-port of the Arihant class.
* Submarines of the Indian Navy

## References

1. ↑ "India to Construct Two More Arihant Nuclear Submarines for Navy". DefenceNow. http://www.defencenow.com/news/551/india-to-construct-two-more-arihant-nuclear-submarines-for-navy.html.
2. ↑ 2.0 2.1 2.2 2.3 Subramanian, T.S. (15 August 2009). "Nuclear Arm". The Frontline 26 (17). http://www.hindu.com/fline/fl2617/stories/20090828261702500.htm. Retrieved 2 June 2015.
3. ↑ "Founder's Day Speech, Director, BARC". Bhabha Atomic Research Centre. 30 October 2018. http://www.barc.gov.in/presentations/fddir18.pdf.
4. ↑ "DAE (Excellence in Science, Engineering & Technology) Awards 2010". BARC Newsletter (322): 33. 2011. http://www.barc.gov.in/publications/nl/2011/2011091009.pdf. Retrieved 21 March 2021.
5. ↑ 5.0 5.1 "Retrieved on 2016-10-21.". http://www.naval-technology.com/projects/arihant-class/.
6. ↑ "Defence News - Arihant has dived below "crushing depths"". http://www.defencenews.in/defence-news-internal.aspx?get=new&id=R5mr0CLjcww=.
7. ↑ Pike, John (27 July 2009). "Advanced Technology Vessel (ATV)". globalsecurity.org. http://www.globalsecurity.org/military/world/india/atv-specs.htm.
8. ↑ Unnithan, Sandeep (December 10, 2017). "From India Today magazine: A peek into India's top secret and costliest defence project, nuclear submarines" (in en). https://www.indiatoday.in/magazine/the-big-story/story/20171218-india-ballistic-missile-submarine-k-6-submarine-launched-drdo-1102085-2017-12-10.
9. ↑ Anandan, S. (2014-12-20). "INS Arihant may be of limited utility" (in en-IN). The Hindu. ISSN 0971-751X. https://www.thehindu.com/news/national/ins-arihant-may-be-of-limited-utility/article6709623.ece.
10. ↑ "INS Arihant not to feature at International Fleet Review: Indian Navy chief - The Economic Times". http://economictimes.indiatimes.com/news/defence/ins-arihant-not-to-feature-at-international-fleet-review-indian-navy-chief/articleshow/50865629.cms.
11. ↑ 11.0 11.1 Pubby, Manu. "India's first nuclear submarine INS Arihant ready or operations, passes deep sea tests - The Economic Times". http://economictimes.indiatimes.com/news/defence/indias-first-nuclear-submarine-ins-arihant-ready-for-operations-passes-deep-sea-tests/articleshow/51098650.cms.
12. ↑ 12.0 12.1 "Now, India has a nuclear triad". http://www.thehindu.com/news/national/now-india-has-a-nuclear-triad/article9231307.ece.
13. ↑ Vibhaas, Sane (18 October 2016). "Nuclear Submarine INS Arihant Inducted 'Quietly' In Indian Navy (Land, Air, and Water)", Dainik Bhaskar.
14. ↑ "SSBN Arihant Class Submarine, India". naval-technology.com. http://www.naval-technology.com/projects/arihant-class/.
15. ↑ "Arihant – Advanced Technology Vessel (ATV)". Global Security. http://www.globalsecurity.org/military/world/india/atv.htm.
16. ↑ "Leased Russian n-submarine to set sail for India this month end". indiatoday. 15 December 2011. http://indiatoday.intoday.in/story/leased-russian-n-submarine-to-set-sail-for-india-this-month-end/1/164449.html.
17. ↑ Pandit, Rajat (3 December 2009). "Home-made nuke sub INS Arihant to be inducted in 2 years". The Times of India. https://timesofindia.indiatimes.com/india/Home-made-nuke-sub-INS-Arihant-to-be-inducted-in-2-years/articleshow/5293123.cms.
18. ↑ 18.0 18.1 18.2 Pandit, Rajat (10 August 2013). "Reactor of India's first indigenous nuclear submarine INS Arihant goes 'critical'". The Times of India. http://timesofindia.indiatimes.com/india/Reactor-of-Indias-first-indigenous-nuclear-submarine-INS-Arihant-goes-critical/articleshow/21737816.cms.
19. ↑ Pandit, Rajat (17 July 2009). "India set to launch nuclear-powered submarine". The Times of India. https://timesofindia.indiatimes.com/india/India-set-to-launch-nuclear-powered-submarine/articleshow/4787167.cms.
20. ↑ Subramanian, T.S. (2 August 2009). "PWR building shows indigenous capability, says Kakodkar". The Hindu (Chennai, India). http://www.hindu.com/2009/08/03/stories/2009080353810100.htm.
21. ↑ Venkatesh, MR (2 August 2009). "Arihant propulsion reactor unveiled". Hindustan Times. http://www.hindustantimes.com/StoryPage/StoryPage.aspx?sectionName=HomePage&id=5721403d-8f66-43e2-92c4-4f3148032565&Headline=Arihant+propulsion+reactor+unveiled.
22. ↑ "The secret undersea weapon". indiatoday. 17 January 2008. http://indiatoday.intoday.in/index.php?option=com_content&task=view&&issueid=37&id=3659&Itemid=1&page=in&latn=2.
23. ↑ Joseph, Josy (27 July 2009). "Private sector played a major role in Arihant – India – DNA". Daily News and Analysis. http://www.dnaindia.com/india/report_private-sector-played-a-major-role-in-arihant_1277435.
24. ↑ Bagla, Pallava (3 August 2009). "Russians helped with INS Arihant's heart: Kakodkar". NDTV. http://www.ndtv.com/article/india/russians-helped-with-ins-arihant-s-heart-kakodkar-6659.
25. ↑ Malhotra, Jyoti (12 August 2013). "How India's pride INS Arihant was built". Business Standard. http://www.business-standard.com/article/specials/how-india-s-pride-ins-arihant-was-built-113081100745_1.html.
26. ↑ Subramanian, T.S. (8 May 2014). "Success on debut for undersea launch of missile". The Hindu. http://www.thehindu.com/news/national/success-on-debut-for-undersea-launch-of-missile/article5986757.ece.
27. ↑ "India tests new underwater nuclear missile". The Times of India. 26 March 2014. http://timesofindia.indiatimes.com/india/India-tests-new-underwater-nuclear-missile/articleshow/32694060.cms.
28. ↑ Thapar, Vishal (10 May 2014). "India tests 3,000 km range n-missile in secret". The Sunday Guardian. http://www.sunday-guardian.com/news/india-tests-3000-km-range-n-missile-in-secret.
29. ↑ Jayaraman, KS (13 August 2009). "India's Nuclear Sub Doesn't Have Working Reactor Yet". Daiji World. http://www.daijiworld.com/news/news_disp.asp?n_id=64065&n_tit=India's+Nuclear+Sub+Doesn't+Have+Working+Reactor+Yet.
30. ↑ Von Kospoth, Nicolas (28 July 2009). "India's INS Arihant Makes First Contact with Water". Defense Professionals Daily. http://www.defpro.com/daily/details/364/.
31. ↑ "India's first home-built nuclear submarine INS Arihant set for trials". 7 August 2012. http://articles.economictimes.indiatimes.com/2012-08-07/news/33083483_1_ins-arihant-nuclear-submarine-sea-trials.
32. ↑ Mallikarjun, Y.; Subramanian, T. S. (27 January 2013). "India successfully test-fires underwater missile". The Hindu (Chennai, India). http://www.thehindu.com/news/national/india-successfully-testfires-underwater-missile/article4350553.ece.
33. ↑ "Arihant achieves criticality when the boat was "already in the sea"". Jagran Josh. 11 August 2013. http://www.jagranjosh.com/current-affairs/nuclear-reactor-of-ins-arihant-achieved-criticality-when-the-boat-was-in-the-sea-1376214166-1.
34. ↑ "Wife of Indian PM launches home-made nuclear attack submarine". Xinhuanet. 26 July 2009. http://news.xinhuanet.com/english/2009-07/26/content_11775324.htm.
35. ↑ Unnithan, Sandeep (16 July 2009). "Exclusive: PM's wife to launch INS Arihant, India's first nuclear submarine". indiatoday. http://indiatoday.intoday.in/index.php?option=com_content&task=view&id=51956&sectionid=4&secid=&Itemid=1&issueid=114.
36. ↑ "India inducts nuke submarine into navy". The Hindu (Chennai, India). 26 July 2009. http://www.hindu.com/thehindu/holnus/000200907261621.htm.
37. ↑ "PIB's Latest Photograph". Pib.nic.in. http://pib.nic.in/release/phsmall.asp?phid=23704.
38. ↑ "PIB's Latest Photograph". Pib.nic.in. http://pib.nic.in/release/phsmall.asp?phid=23703.
39. ↑ Singh, Harmeet Shah (26 July 2009). "India launches nuclear submarine". CNN. http://edition.cnn.com/2009/WORLD/asiapcf/07/26/india.nuclear.submarine/index.html.
40. ↑ "India's nuclear submarine Arihant flagged off for sea trials". Economic Times. 13 December 2014. http://economictimes.indiatimes.com/news/politics-and-nation/indias-nuclear-submarine-arihant-flagged-off-for-sea-trials/articleshow/45526418.cms.
41. ↑ "Indigenous n-sub's sea trials by year-end". Business Standard. Indo-Asian News Service. 2 November 2014. https://www.business-standard.com/article/news-ians/indigenous-n-sub-s-sea-trials-by-year-end-114110200417_1.html.
42. ↑ Luthra, Gulshan (26 November 2015). "Nuclear capable Arihant submarine successfully test-fires unarmed missile". The Economic Times. http://economictimes.indiatimes.com/articleshow/49935508.cms.
43. ↑ "INS Arihant completes India's nuclear triad, PM Modi felicitates crew". The Economic Times. 2018-11-06. https://economictimes.indiatimes.com/news/defence/ins-arihant-completes-indias-nuclear-triad-pm-modi-felicitates-crew/articleshow/66509959.cms.
44. ↑ Singh, Ashish (17 October 2016). "NewsX Exclusive: India completes 'nuclear triad' with INS Arihant". NewsX. http://www.newsx.com/national/43962-newsx-exclusive-india-completes-nuclear-triad-with-ins-arihant.
45. ↑ "India's nuclear triad is complete with INS Arihant ending its first deterrence patrol" (in en-IN). The Hindu. 2018-11-05. ISSN 0971-751X. https://www.thehindu.com/news/national/ins-arihant-completes-deterrence-patrol-india-declares-nuclear-traid-operational/article25425436.ece.
46. ↑ "India Learned One Way How to Sink a $3 Billion Dollar Submarine: Leave a Hatch Open". 22 August 2019. https://nationalinterest.org/blog/buzz/india-learned-one-way-how-sink-3-billion-dollar-submarine-leave-hatch-open-75361?amp.
47. ↑ Peri, Dinakar; Joseph, Josy (8 January 2018). "INS Arihant left crippled after 'accident' 10 months ago" (in en-IN). The Hindu. https://www.thehindu.com/news/national/ins-arihant-left-crippled-after-accident-10-months-ago/article22392049.ece.
48. ↑ Pubby, Manu (8 January 2018). "India's only nuclear-armed submarine is back in the water after contamination fears". The Print. https://theprint.in/report/indias-only-nuclear-armed-submarine-ins-arihant-is-back-in-the-water/27307/.
49. ↑ Suciu, Peter (2021-06-28). "The Dumbest Way Ever to Sink a Submarine? An Open Hatch (It Nearly Happened)" (in en-US). https://www.19fortyfive.com/2021/06/the-dumbest-way-ever-to-sink-a-submarine-an-open-hatch-it-nearly-happened/.
50. ↑ Bedi, Rahul (2021-12-30). "India Quietly Launches Third Arihant-Class Nuclear-Powered Submarine: Report". The Wire. https://thewire.in/security/india-quietly-launches-its-third-arihant-class-nuclear-powered-submarine-report. ""It also features a double hull""
51. ↑ "Deep diving into the facts about INS Arihant 'accident'". The Economic Times. 12 January 2018. https://economictimes.indiatimes.com/news/defence/deep-diving-into-the-facts-about-ins-arihant-accident/articleshow/62468708.cms.
52. ↑ "Is INS Arihant Damaged? Can't Divulge Information in National Interest, Says Government". News18. 21 March 2018. https://www.news18.com/news/india/is-ins-arihant-damaged-cant-divulge-information-in-national-interest-says-government-1695833.html.
53. ↑ https://economictimes.indiatimes.com/news/defence/deep-diving-into-the-facts-about-ins-arihant-accident/articleshow/62468708.cms?from=mdr
54. ↑ Siddiqui, Huma (5 November 2018). "INS Arihant: India's first indigenous nuclear-powered submarine completes Nuclear Triad; PM Modi hails crew; top things to know". The Financial Express. https://www.financialexpress.com/defence/ins-arihant-indias-first-indigenous-nuclear-powered-submarine-completes-nuclear-triad-pm-modi-hails-crew-top-things-to-know/1373492/.
55. ↑ Unnithan, Sandeep (5 November 2018). "INS Arihant returned yesterday from 20-day deterrent patrol" (in en). https://www.indiatoday.in/india/story/ins-arihant-returned-yesterday-from-20-day-deterrent-patrol-1383188-2018-11-05.
56. ↑ "Prime Minister felicitates crew of INS Arihant on completion of Nuclear Triad". 5 November 2018. http://pib.gov.in/Pressreleaseshare.aspx?PRID=1551894.
57. ↑ "INS Arihant carries out successful launch of submarine launched ballistic missile" (in en). 2022-10-14. https://indianexpress.com/article/india/ins-arihant-successful-launch-of-submarine-launched-ballistic-missile-8208825/.
58. ↑ Peri, Dinakar (2022-10-14). "INS Arihant launches Submarine Launched Ballistic Missile" (in en-IN). The Hindu. ISSN 0971-751X. https://www.thehindu.com/news/national/ins-arihant-launches-submarine-launched-ballistic-missile/article66010395.ece.

## External links

* v
* t
* e

Submarines of the Indian Navy

Commissioned|

| Nuclear-powered|

| Arihant class|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

|

Conventionally-powered
(diesel-electric)|

| Script error: The function "sclass" does not exist.|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

|

Script error: The function "sclass" does not exist.|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

Kalvari class (2015)|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

Future submarines|

| Nuclear-powered|

| Script error: The function "sclass" does not exist.|

* Aridhaman
* S4*

|

Conventionally-powered
(diesel-electric)|

| Kalvari class (2015)|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

|

Decommissioned|

| Nuclear-powered|

| Script error: The function "sclass" does not exist.|

* Chakra (K43)

|

Improved Akula I class|

* Chakra (S71)

Conventionally-powered
(diesel-electric)|

| Kalvari class (1967)|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

|

Script error: The function "sclass" does not exist.|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

Script error: The function "sclass" does not exist.|

* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.
* Script error: The function "ship_prefix_templates" does not exist.

fr:Classe Arihant

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/INS Arihant. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Engineering:INS_Arihant&oldid=4115356"
*[lit.]: literal translation
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template