{"id":20640,"date":"2026-10-05T07:37:40","date_gmt":"2026-10-05T07:37:40","guid":{"rendered":"https:\/\/tunnelingworld.com\/?p=20640"},"modified":"2026-10-05T07:37:40","modified_gmt":"2026-10-05T07:37:40","slug":"chennai-metro-phase-ii-records-three-tunnel-breakthroughs-in-three-days","status":"publish","type":"post","link":"https:\/\/tunnelingworld.com\/?p=20640","title":{"rendered":"Chennai Metro Phase II Records Three Tunnel Breakthroughs in Three Days"},"content":{"rendered":"<p>The latest breakthrough also marks the <strong>10th tunnelling breakthrough on Corridor 3<\/strong>, highlighting continued progress on the underground sections of the Chennai Metro Phase II project.<\/p>\n<p><strong>Three Chennai Metro Phase II Tunnel Breakthroughs<\/strong><\/p>\n<p>The first breakthrough took place on <strong>September 29<\/strong>, when <strong>TBM Kaveri<\/strong> arrived at Kilpauk Medical College (KMC) Station on the down line of Corridor 3.<\/p>\n<p>On <strong>September 30<\/strong>, <strong>TBM Maruthan<\/strong> completed its drive and reached Villivakkam Station on the down line of Corridor 5.<\/p>\n<p>A third breakthrough followed on <strong>October 1<\/strong>, when <strong>TBM Adyar<\/strong> reached RK Salai Station on Corridor 3\u2019s down line.<\/p>\n<p>The three breakthroughs demonstrate progress across multiple underground construction packages and represent an important milestone for <strong>Chennai Metro Phase II tunnelling works<\/strong>.<\/p>\n<p><strong>Corridor 3 Tunnel Construction<\/strong><\/p>\n<p>Larsen &amp; Toubro is constructing the <strong>12km underground section of Corridor 3 between Kellys and Taramani<\/strong>.<\/p>\n<p>On the section between Chetpet Station and KMC Station, <strong>TBMs Kaveri and Tamarabharani<\/strong> began tunnelling in February 2024. Tamarabharani completed the corresponding upline drive in November 2025.<\/p>\n<p>The two TBMs had to excavate a <strong>685m-long tunnel<\/strong> through challenging urban conditions. The alignment passed beneath five operational Southern Railway tracks near Chetpet Station, with approximately 18m of overburden.<\/p>\n<p>Further along the route, tunnelling passed beneath the Chetpet Eco Park lake and several Kilpauk Medical College buildings, where overburden ranged from approximately 21m to 26m. The alignment also passed near existing Chennai Metro Phase I tunnels, with a minimum clearance of 6.1m.<\/p>\n<p><strong>TBM Adyar Completes 915m Drive<\/strong><\/p>\n<p>TBMs <strong>Bhavani and Adyar<\/strong> were launched in September 2024 to excavate the tunnel between Royapettah Station and RK Salai Station.<\/p>\n<p>The upline TBM Bhavani completed its <strong>910m drive in October 2025<\/strong>. TBM Adyar subsequently completed a <strong>915m drive<\/strong> through silty sand, with overburden ranging from 9m to 13m.<\/p>\n<p>Adyar\u2019s breakthrough represents the <strong>10th tunnelling breakthrough on the TU02 contract<\/strong>, adding another milestone to Corridor 3 construction.<\/p>\n<p><strong>TBM Maruthan Advances Corridor 5 Tunnelling<\/strong><\/p>\n<p>On Corridor 5, <strong>Tata Projects<\/strong> is responsible for an underground section with a total tunnel length of <strong>7.88km<\/strong>.<\/p>\n<p>Tata Projects launched <strong>TBM Maruthan on April 24, 2026<\/strong>, to excavate the 601m tunnel between Villivakkam Railway Station and Villivakkam Bus Terminus Metro Station.<\/p>\n<p>The drive presented several tunnelling challenges, including excavation beneath <strong>five operational railway lines at Villivakkam Railway Station<\/strong>. Ground protection measures were also required because the alignment passes through a heavily populated residential area.<\/p>\n<p><strong>Chennai Metro Phase II Project<\/strong><\/p>\n<p>Chennai Metro Phase II comprises <strong>three metro corridors<\/strong>, extending the city\u2019s rapid transit network by approximately <strong>118.9km with 128 stations<\/strong>.<\/p>\n<p>The project includes extensive underground construction using tunnel boring machines, with multiple contractors delivering different sections of the network.<\/p>\n<p>Chennai Metro Phase II is scheduled for completion by <strong>the end of 2028<\/strong>. The latest sequence of breakthroughs on Corridors 3 and 5 marks further progress towards completing the city\u2019s major metro expansion.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The latest breakthrough also marks the 10th tunnelling breakthrough on Corridor 3, highlighting continued progress on the underground sections of the Chennai Metro Phase II project. Three Chennai Metro Phase II Tunnel Breakthroughs The first breakthrough took place on September 29, when TBM Kaveri arrived at Kilpauk Medical College (KMC) Station on the down line of Corridor 3. On September 30, TBM Maruthan completed its drive and reached Villivakkam Station on the down line of Corridor 5. A third breakthrough followed on October 1, when TBM Adyar reached RK Salai Station on Corridor 3\u2019s down line. The three breakthroughs demonstrate [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":20641,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4001],"tags":[8,5627,5628,5625,5626,5632,3349,5633,5631,3695,5629,5630],"class_list":["post-20640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contract-projects","tag-asian","tag-chennai-metro-corridor-3","tag-chennai-metro-corridor-5","tag-chennai-metro-phase-2","tag-chennai-metro-tunnelling","tag-chennai-underground-metro","tag-larsen-toubro","tag-metro-tunnel-construction-india","tag-tata-projects","tag-tbm-adyar","tag-tbm-kaveri","tag-tbm-maruthan","post--single"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chennai Metro Phase II Records Three Tunnel Breakthroughs<\/title>\n<meta name=\"description\" content=\"Chennai Metro Phase II records three tunnel breakthroughs in three days, with TBMs Kaveri, Maruthan and Adyar advancing Corridors 3 and 5.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tunnelingworld.com\/?p=20640\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chennai Metro Phase II Records Three Tunnel Breakthroughs\" \/>\n<meta property=\"og:description\" content=\"Chennai Metro Phase II records three tunnel breakthroughs in three days, with TBMs Kaveri, Maruthan and Adyar advancing Corridors 3 and 5.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tunnelingworld.com\/?p=20640\" \/>\n<meta property=\"og:site_name\" content=\"Tunnelingworld\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-05T07:37:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tunnelingworld.com\/wp-content\/uploads\/2026\/10\/Image-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"944\" \/>\n\t<meta property=\"og:image:height\" content=\"555\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"rosebell\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rosebell\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640\"},\"author\":{\"name\":\"rosebell\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/#\\\/schema\\\/person\\\/4d2f4182b445645aa0b79f3f43560eba\"},\"headline\":\"Chennai Metro Phase II Records Three Tunnel Breakthroughs in Three Days\",\"datePublished\":\"2026-10-05T07:37:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640\"},\"wordCount\":460,\"image\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/tunnelingworld.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/Image-1.png\",\"keywords\":[\"asian\",\"Chennai Metro Corridor 3\",\"Chennai Metro Corridor 5\",\"Chennai Metro Phase 2\",\"Chennai Metro tunnelling\",\"Chennai underground metro\",\"Larsen &amp; Toubro\",\"metro tunnel construction India\",\"Tata Projects\",\"TBM Adyar\",\"TBM Kaveri\",\"TBM Maruthan\"],\"articleSection\":[\"Contract\\\/projects\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640\",\"url\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640\",\"name\":\"Chennai Metro Phase II Records Three Tunnel Breakthroughs\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/tunnelingworld.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/Image-1.png\",\"datePublished\":\"2026-10-05T07:37:40+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/#\\\/schema\\\/person\\\/4d2f4182b445645aa0b79f3f43560eba\"},\"description\":\"Chennai Metro Phase II records three tunnel breakthroughs in three days, with TBMs Kaveri, Maruthan and Adyar advancing Corridors 3 and 5.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#primaryimage\",\"url\":\"https:\\\/\\\/tunnelingworld.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/Image-1.png\",\"contentUrl\":\"https:\\\/\\\/tunnelingworld.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/Image-1.png\",\"width\":944,\"height\":555,\"caption\":\"Chennai Metro Phase II\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/?p=20640#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/tunnelingworld.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Chennai Metro Phase II Records Three Tunnel Breakthroughs in Three Days\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/#website\",\"url\":\"https:\\\/\\\/tunnelingworld.com\\\/\",\"name\":\"Tunnelingworld\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/tunnelingworld.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/tunnelingworld.com\\\/#\\\/schema\\\/person\\\/4d2f4182b445645aa0b79f3f43560eba\",\"name\":\"rosebell\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/40b92c3f35ab56dec639479a669ce3f5158c2ac3b5cf54852fc3df01779a0812?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/40b92c3f35ab56dec639479a669ce3f5158c2ac3b5cf54852fc3df01779a0812?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/40b92c3f35ab56dec639479a669ce3f5158c2ac3b5cf54852fc3df01779a0812?s=96&d=mm&r=g\",\"caption\":\"rosebell\"},\"url\":\"https:\\\/\\\/tunnelingworld.com\\\/?author=5\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Chennai Metro Phase II Records Three Tunnel Breakthroughs","description":"Chennai Metro Phase II records three tunnel breakthroughs in three days, with TBMs Kaveri, Maruthan and Adyar advancing Corridors 3 and 5.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/tunnelingworld.com\/?p=20640","og_locale":"en_US","og_type":"article","og_title":"Chennai Metro Phase II Records Three Tunnel Breakthroughs","og_description":"Chennai Metro Phase II records three tunnel breakthroughs in three days, with TBMs Kaveri, Maruthan and Adyar advancing Corridors 3 and 5.","og_url":"https:\/\/tunnelingworld.com\/?p=20640","og_site_name":"Tunnelingworld","article_published_time":"2026-10-05T07:37:40+00:00","og_image":[{"width":944,"height":555,"url":"https:\/\/tunnelingworld.com\/wp-content\/uploads\/2026\/10\/Image-1.png","type":"image\/png"}],"author":"rosebell","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rosebell","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/tunnelingworld.com\/?p=20640#article","isPartOf":{"@id":"https:\/\/tunnelingworld.com\/?p=20640"},"author":{"name":"rosebell","@id":"https:\/\/tunnelingworld.com\/#\/schema\/person\/4d2f4182b445645aa0b79f3f43560eba"},"headline":"Chennai Metro Phase II Records Three Tunnel Breakthroughs in Three Days","datePublished":"2026-10-05T07:37:40+00:00","mainEntityOfPage":{"@id":"https:\/\/tunnelingworld.com\/?p=20640"},"wordCount":460,"image":{"@id":"https:\/\/tunnelingworld.com\/?p=20640#primaryimage"},"thumbnailUrl":"https:\/\/tunnelingworld.com\/wp-content\/uploads\/2026\/10\/Image-1.png","keywords":["asian","Chennai Metro Corridor 3","Chennai Metro Corridor 5","Chennai Metro Phase 2","Chennai Metro tunnelling","Chennai underground metro","Larsen &amp; Toubro","metro tunnel construction India","Tata Projects","TBM Adyar","TBM Kaveri","TBM Maruthan"],"articleSection":["Contract\/projects"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/tunnelingworld.com\/?p=20640","url":"https:\/\/tunnelingworld.com\/?p=20640","name":"Chennai Metro Phase II Records Three Tunnel Breakthroughs","isPartOf":{"@id":"https:\/\/tunnelingworld.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/tunnelingworld.com\/?p=20640#primaryimage"},"image":{"@id":"https:\/\/tunnelingworld.com\/?p=20640#primaryimage"},"thumbnailUrl":"https:\/\/tunnelingworld.com\/wp-content\/uploads\/2026\/10\/Image-1.png","datePublished":"2026-10-05T07:37:40+00:00","author":{"@id":"https:\/\/tunnelingworld.com\/#\/schema\/person\/4d2f4182b445645aa0b79f3f43560eba"},"description":"Chennai Metro Phase II records three tunnel breakthroughs in three days, with TBMs Kaveri, Maruthan and Adyar advancing Corridors 3 and 5.","breadcrumb":{"@id":"https:\/\/tunnelingworld.com\/?p=20640#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/tunnelingworld.com\/?p=20640"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/tunnelingworld.com\/?p=20640#primaryimage","url":"https:\/\/tunnelingworld.com\/wp-content\/uploads\/2026\/10\/Image-1.png","contentUrl":"https:\/\/tunnelingworld.com\/wp-content\/uploads\/2026\/10\/Image-1.png","width":944,"height":555,"caption":"Chennai Metro Phase II"},{"@type":"BreadcrumbList","@id":"https:\/\/tunnelingworld.com\/?p=20640#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/tunnelingworld.com\/"},{"@type":"ListItem","position":2,"name":"Chennai Metro Phase II Records Three Tunnel Breakthroughs in Three Days"}]},{"@type":"WebSite","@id":"https:\/\/tunnelingworld.com\/#website","url":"https:\/\/tunnelingworld.com\/","name":"Tunnelingworld","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/tunnelingworld.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/tunnelingworld.com\/#\/schema\/person\/4d2f4182b445645aa0b79f3f43560eba","name":"rosebell","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/40b92c3f35ab56dec639479a669ce3f5158c2ac3b5cf54852fc3df01779a0812?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/40b92c3f35ab56dec639479a669ce3f5158c2ac3b5cf54852fc3df01779a0812?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/40b92c3f35ab56dec639479a669ce3f5158c2ac3b5cf54852fc3df01779a0812?s=96&d=mm&r=g","caption":"rosebell"},"url":"https:\/\/tunnelingworld.com\/?author=5"}]}},"_links":{"self":[{"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/posts\/20640","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=20640"}],"version-history":[{"count":1,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/posts\/20640\/revisions"}],"predecessor-version":[{"id":20642,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/posts\/20640\/revisions\/20642"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=\/wp\/v2\/media\/20641"}],"wp:attachment":[{"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tunnelingworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}