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Denmark Issues Investigation Report Into Loss of Maersk Supply Ships Off France

Denmark Issues Investigation Report Into Loss of Maersk Supply Ships Off France
The Danish Maritime Accident Investigation Board has released its investigation report into the loss of two former Maersk Supply Ships during a side-by-side tow to the breakers in December 2016

Saying the event was a ‘systematic accident’ not limited to any single factor or root cause.

The DMAIB report details the events and circumstances that led to the loss and foundering of the Maersk Searcher and Maersk Shipper off France following a request for an investigation by the French authorities. 

The two Danish offshore supply ships capsized and sank December 22, 2016 in the Bay of Biscay approximately 65 nautical miles off the French coast while being towed by another offshore supply ship, Maersk Battler, while en route to a scrapyard in Turkey.

The supply ships were unmanned at the time and configured in a side-by-side towing setup during the voyage. But during passage through the English Channel, the fenders between the ships on tow failed, and the ships started to collide. The constant battering caused extensive damage to the vessels and eventually compromised the watertight integrity of the Maersk Searcher, causing it to take on water and sink. Subsequently, the Maersk Shipper was also pulled under, so the crew on the Maersk Battler cut both ships loose.

The report stated that the side-by-side towing configuration, which was criticised by some in the aftermath of the incident, was one of three towing methods considered for the job. The two others included a double tow using two winches and a serial tow (one after the other).

In their investigation into the circumstances leading to the accident, the DMAIB describes the accident as ‘systematic’ and unrelated to any single event or action aboard the Maersk Battler at the time.

“The DMAIB regards the foundering of MÆRSK SEARCHER and MÆRSK SHIPPER as a systemic accident. This means that local and technical circumstances unfolding on board MÆRSK BATTLER during the voyage cannot be isolated from the preceding organisational events and circumstances taking place months earlier. Thus, the investigation of the foundering of MÆRSK SEARCHER and MÆRSK SHIPPER is two-fold. It focuses on the technical circumstances leading to the foundering of the two ships and on the organisational circumstances facilitating these technical circumstances.

“It is concluded in the report that the loss of fenders, collision and flooding of the unmanned ships under tow had been addressed in the risk assessment carried out, and that risk mitigating initiatives were in place for each risk item. However, these initiatives were ineffective. The DMAIB concludes that the risk mitigating strategies were mainly focused on preventing risk factors in isolation and left little or no contingency for acute interaction between the risk factors,” the DMAIB report stated.

Maersk Shipper and Maersk Searcher were formerly owned by Maersk Supply Service, but both were sold for scrap earlier in the year due to global decline in the oil and gas industry. Being that the tow of the vessels was part of Maersk Supply Services core services, the job was kept in-house.

The report stated that the company spent at least four months preparing for the tow and the preparation involved a large number of persons

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