3.1 Findings as to causes and contributing factors
- The second mate, who was working alone on the bridge, was fatigued.
- The second mate fell asleep and did not make the planned course alteration, and the articulated tug-barge struck and grounded on a reef.
- The navigational alarms were not used and a bridge navigational watch alarm system was not available; the use of these could have prevented the second mate from falling asleep and provided a warning to other crew members.
- The other crew member on watch was not on the bridge and did not reach the wheelhouse prior to the grounding.
- Following the grounding, and after several hours of continuous interaction between the tug’s hull and the reef, the hull breached and released diesel oil into the environment.
- The pollution boom around the tug did not contain the diesel oil; approximately 110 000 L of diesel oil were not recoverable and were left in the environment.
Tug was grinding on the rocks independent of the barge.