{"id":598,"date":"2026-09-07T09:38:42","date_gmt":"2026-09-07T09:38:42","guid":{"rendered":"https:\/\/regulasshipping.com\/blog\/marmara-collision-watch-failures-dark-ais-10-missing\/"},"modified":"2026-09-07T09:38:42","modified_gmt":"2026-09-07T09:38:42","slug":"marmara-collision-watch-failures-dark-ais-10-missing","status":"publish","type":"post","link":"https:\/\/regulasshipping.com\/blog\/marmara-collision-watch-failures-dark-ais-10-missing\/","title":{"rendered":"Marmara Collision Report: Watch Failures and Dark AIS Left 10 Missing After 11-Minute Sinking"},"content":{"rendered":"

On 2 September 2026<\/strong>, at about 03:13 local time<\/strong>, two Turkish-flagged ships met in the Sea of Marmara Traffic Separation Scheme about 18 nautical miles south of Silivri<\/strong>. The 1990-built general cargo ship Tu\u011fberk \u0130mamo\u011flu<\/strong> (about 90 metres, roughly 4,600 dwt), loaded with some 4,200 tonnes of steel coil and rebar<\/strong> on a voyage from \u0130skenderun toward Karadeniz Ere\u011fli, tore open on the port side and sank in about 11 minutes<\/strong>. All 10 crew<\/strong>, Turkish nationals including the master, remain missing. Water depth at the site is on the order of 800\u2013900 metres<\/strong>. Search teams later found the ship\u2019s free-fall lifeboat and other survival craft empty in the water.<\/p>\n

The other ship, the 2022-built product\/chemical tanker Alsu<\/strong> (about 91 metres, 3,338 dwt), was in ballast from Kocaeli toward Alia\u011fa. She took only light starboard-side scrapes, continued, and later anchored at Alia\u011fa pending investigation. Weather was not a factor: a north wind of about Beaufort 4, slight sea, broken cloud and roughly six nautical miles of visibility<\/strong>, with no fog, heavy rain or current that would have limited manoeuvre. Turkey\u2019s Transport Minister confirmed the cargo ship went down \u201cextremely fast,\u201d which is the operational reason the crew never organised a controlled abandonment.<\/p>\n

A preliminary expert report prepared for the Silivri Chief Public Prosecutor<\/strong> now frames the collision as a two-bridge failure<\/strong>, not a single last-second steering error. Investigators who reviewed Alsu\u2019s limited ECDIS playback, log entries, crew statements and Bridge Management Manual say the root cause was \u201cbilateral bridge discipline failure, complete abandonment of watch standards, and loss of situational awareness.\u201d<\/strong> Tu\u011fberk \u0130mamo\u011flu was operating, in the committee\u2019s words, in \u201cghost ship\u201d mode<\/strong>: AIS off, failed or otherwise not transmitting, so Alsu first saw her as a radar echo at about 1.8 nautical miles<\/strong> rather than as an identified AIS target. Coastal VTS recordings submitted to the file so far show no image of Tu\u011fberk \u0130mamo\u011flu<\/strong>, even though she appeared on Alsu\u2019s ECDIS.<\/p>\n

The playback timeline is tight. Around 03:06<\/strong> the cargo ship was a missing-echo radar contact on course about 082\u00b0 at 7.2 knots. Between 03:08 and 03:09<\/strong> Alsu\u2019s lone watch officer said he agreed on VHF 16 that the other ship would keep clear to port, and Alsu began altering to port. At about 03:10<\/strong>, with Alsu heading near 284\u00b0, the cargo ship dropped off and reappeared about 0.5 nautical miles<\/strong> away, turning hard to starboard contrary to that radio understanding. Collision followed at 03:12\u201303:13<\/strong>: Tu\u011fberk \u0130mamo\u011flu on about 133\u00b0 at 5.8 knots, Alsu still making about 7.8 knots<\/strong>. The committee\u2019s working reconstruction is that the cargo ship crossed Alsu\u2019s bow and struck port shoulder to starboard shoulder. Why a 90-metre cargo ship then sank in 11 minutes is still open; cargo shift, lashing and stability calculations from the loading port have been requested.<\/p>\n

Alsu\u2019s own SMS is what turns a close-quarters event into a company-level finding. The tanker\u2019s Bridge Management Manual required Watch Condition B<\/strong> in that TSS. At the time of impact the only person on the bridge was third officer Murat Evciman<\/strong>, who had joined the ship on 31 August<\/strong> and was standing his first navigational watch<\/strong> on board (0000\u20130400). There was no lookout and no helmsman. Master Ahmet Erarslan<\/strong> was asleep in his cabin and reached the bridge only 7\u201310 minutes after the collision<\/strong>. The report treats that manning as a COLREG lookout breach and an SMS breach, and it argues that an experienced master plus a lookout would likely have detected the starboard swing at 1.5\u20131.8 nautical miles<\/strong> instead of 0.5, leaving time under COLREG Rule 8<\/strong> to stop engines or go emergency astern. Instead the officer kept altering to port at close range rather than taking off way.<\/p>\n

Liability is already moving from the expert file into criminal process. The prosecutor has opened proceedings against nine suspects. On the current evidence, Alsu\u2019s master and the watch officer were arrested on a charge of causing the death of multiple persons through negligence<\/strong>; four other crew were released under judicial control. Tu\u011fberk \u0130mamo\u011flu\u2019s owner has said the ship was in her TSS lane, classed and certificated, and that her master had already warned Alsu by VHF that the tanker was entering her water \u2014 a claim that sits awkwardly against Alsu\u2019s later VTS report of a collision with an \u201cunidentified\u201d<\/strong> vessel. Final fault will wait on VDR, full VHF audio, expanded radar and the cargo-securing record. For operators, the usable lesson does not wait: a busy TSS at 03:00, a dark AIS target and a single unfamiliar officer is already a predictable loss-of-life scenario, even in clear weather.<\/p>\n

The commercial overlay is narrower than a war-risk story but still real for Marmara, Turkish Straits and short-sea steel trades. A loaded coil ship that sinks in 11 minutes will drive P&I, hull and cargo questions about watch composition, AIS availability, night-order books and cargo securing. Charterers who treat \u201cdomestic TSS, good visibility\u201d as low risk should re-price the human factor. The empty lifeboat is a reminder that SOLAS survival craft do not compensate for a hull-opening event that outruns abandonment drills.<\/p>\n

What Operators Should Note<\/h2>\n
    \n
  • Treat Watch Condition B as a hard night-order in TSS waters<\/strong> \u2014 master or extra lookout on the bridge in the 0000\u20130400 watch, not a single newly joined officer, regardless of visibility.<\/li>\n
  • Do not accept a dark or intermittent AIS target as \u201cunidentified until VHF.\u201d<\/strong> Radar echo at 1.8 nautical miles is already a close-quarters problem; plot, reduce speed and call VTS immediately.<\/li>\n
  • VHF agreement is not a COLREG dispensation.<\/strong> If the other ship turns across the agreed side, Rule 8 speed reduction and astern take priority over continuing a port alteration at 0.5 nautical miles.<\/li>\n
  • Audit AIS as a critical navigation aid, not a convenience transmitter.<\/strong> A cargo ship that is invisible to VTS while still painting on another ship\u2019s ECDIS is a company ISM finding waiting to happen.<\/li>\n
  • Steel-coil and other high-density cargoes need a sinking-time assumption in the drill.<\/strong> Eleven minutes from impact to foundering leaves no margin if the port shell is opened; abandon-ship cues must start from flooding, not from a completed damage-control round.<\/li>\n
  • Expect criminal as well as civil exposure when SMS watch tables are ignored.<\/strong> Alsu\u2019s master and watch officer are already in custody; \u201cI had authority not to post a lookout\u201d did not survive comparison with the ship\u2019s own BMM.<\/li>\n
  • Keep Marmara and Turkish Straits voyage files updated<\/strong> with the prosecutor\u2019s requests for VDR, VHF audio, stowage plans and lashing certificates \u2014 those records will decide both fault and cargo recoveries.<\/li>\n<\/ul>\n

    Regulas Shipping will keep following the Silivri investigation, AIS and VTS evidence, and any further findings on why Tu\u011fberk \u0130mamo\u011flu sank so quickly, so masters and CSOs can turn this TSS collision into concrete night-watch and cargo-securing controls.<\/p>\n","protected":false},"excerpt":{"rendered":"

    A Silivri expert report says the 2 September Marmara TSS collision that sank Tu\u011fberk \u0130mamo\u011flu in 11 minutes, with 10 crew missing, was a two-bridge failure: dark AIS plus a lone inexperienced watch on Alsu.<\/p>\n","protected":false},"author":1,"featured_media":597,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wpai_generated_summary":"","wpai_meta_description":"","footnotes":""},"categories":[20,4],"tags":[],"class_list":["post-598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-maritime-regulations","category-maritime-security"],"_links":{"self":[{"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/posts\/598","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/comments?post=598"}],"version-history":[{"count":0,"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/posts\/598\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/media\/597"}],"wp:attachment":[{"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/media?parent=598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/categories?post=598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/regulasshipping.com\/blog\/wp-json\/wp\/v2\/tags?post=598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}