The Nigerian Safety Investigation Bureau has commenced an investigation into the collision involving container vessel MV Maersk Valparaiso and oil tanker MT Lady Martina at Bonny Anchorage in Rivers State. The Bureau, in a statement issued on Friday, classified the incident, which occurred on May 20, 2026, as a “Very Serious Marine Casualty.” According to the statement, the NSIB activated its marine occurrence response protocols immediately after receiving notification of the incident and deployed an investigation Go-Team to Onne and Bonny on May 22, 2026.
“The Nigerian Safety Investigation Bureau has commenced an investigation into the collision between the container vessel MV Maersk Valparaiso and the oil tanker MT Lady Martina, which occurred at Bonny Anchorage, Rivers State, on 20 May 2026. The Bureau has classified the occurrence as a Very Serious Marine Casualty,” the statement read.
It added, “Following receipt of notification, the NSIB promptly activated its marine occurrence response protocols and deployed an investigation Go-Team to Onne and Bonny on 22 May 2026 to initiate evidence preservation and preliminary investigative activities.” The Bureau said investigators boarded both vessels during the initial phase of the exercise and collected evidence, including interviews with the Masters and key crew members.
It noted that operational records and navigational data relevant to the casualty had also been secured and documented. “In the initial phase of the investigation, the team boarded both vessels and carried out critical evidence collection, including detailed interviews with the Masters and key crew members.
Operational records and navigational data relevant to the casualty were also secured and documented,” the statement added. The NSIB further disclosed that the Voyage Data Recorder and Electronic Chart Display and Information System data from MV Maersk Valparaiso had been downloaded for forensic and navigational analysis.
“As part of the technical investigation, the Voyage Data Recorder (VDR) and Electronic Chart Display and Information System (ECDIS) data from MV Maersk Valparaiso have been successfully downloaded for comprehensive forensic and navigational analysis,” it stated.
The sole objective is to establish the causal and contributory factors of the occurrence and to promote enhanced maritime safety,” it stated. The Bureau warned against speculation on the likely causes of the incident while investigations were ongoing. “The investigation remains ongoing.
“Should any urgent safety concerns emerge during the course of the investigation, the Bureau will issue immediate safety recommendations aimed at preventing similar occurrences and strengthening maritime safety standards,” the statement added. The Bureau said the final report would be released upon completion of the investigation in line with national regulations and international obligations.
“The Final Investigation Report will be published upon completion of the investigation in accordance with applicable national regulations and international obligations,” the statement concluded. The collision between MV Maersk Valparaiso and MT Lady Martina on May 20, 2026, had earlier triggered concerns within Nigeria’s maritime sector after the incident resulted in an oil spill and injuries to five crew members aboard the Nigerian-flagged tanker.
The Nigerian Maritime Administration and Safety Agency had confirmed that the Singapore-flagged container vessel and the oil tanker collided at about 11:30 am at the Bonny Inner Anchorage in Rivers State, prompting the immediate deployment of emergency response personnel to the scene.