MAIB Releases Report on Fatal Capsizing of Tug ‘Biter’
The UK Marine Accident Investigation Branch (MAIB) has published a detailed report regarding the tragic capsizing of the tug ‘Biter’, which resulted in the loss of two lives while assisting the ferry ‘Hebridean Princess’ on February 24, 2023. The incident occurred at 3:27 p.m. off Greenock, as the tug was attached to the ferry’s stern while it approached James Watt Dock. Tragically, the two crew members of the ‘Biter’ were unable to escape before the vessel turned over, leading to their deaths.
Circumstances of the Incident
The investigation revealed that the accident stemmed from a combination of factors. The ‘Biter’ was unable to reverse direction effectively, causing it to be towed sideways instead of directly astern of the ‘Hebridean Princess’. This maneuver became critical as the ferry’s speed significantly increased the load on the tug’s towlines, reportedly between two and five times greater than the recommended speed for port operations. As a result, the tug rapidly capsized, and the crew did not have sufficient time to activate the emergency tow release mechanism.
Additionally, the report highlighted a serious concern regarding the tug’s watertight integrity. An open hatch compromised the vessel’s ability to retain air, which likely diminished the crew’s chances of survival after the capsize. The investigation pointed out that the exchanges of information between the tug’s master and the marine pilot were incomplete. This gap in communication meant that there was no opportunity to correct the pilot’s assumptions about the intended maneuvers.
Recommendations for Safety Improvements
In light of the findings, the MAIB has issued several recommendations aimed at enhancing safety protocols. Clyde Marine Services Ltd., the tug’s owners, are advised to review their safety management systems and risk assessments. The recommendations stress the importance of having a clear understanding of towing plans, ensuring proper rigging of the tug’s gob rope, and maintaining closed doors and hatches during towing operations.
Furthermore, Clydeport Operations Ltd. has been urged to conduct an independent review of its marine pilot training and reassess pilot grade limits and the tug matrix. Professional associations representing pilots, harbor masters, and tug owners are also encouraged to develop guidance addressing the safety issues identified in the report.
