A large container ship was forced to seek refuge in a Spanish port after extremely severe weather conditions caused the collapse of several container stacks on deck. The incident once again draws attention to the real risks that extreme weather presents to container securing and vessel stability.

The vessel was en route across the Atlantic/Biscay area when it encountered a very powerful storm system. According to the latest reports, significant wave heights reached 9–11 meters, with individual rogue waves significantly higher. Sustained winds of storm to hurricane force were also reported in the area.

Under these extreme conditions the vessel experienced very violent rolling and pitching. As a result, lashing equipment on several bays could not withstand the enormous dynamic forces. Several container stacks partially or completely collapsed. Some containers were lost overboard, while others were badly damaged and remain in extremely unstable positions on deck.

Main consequences of the incident:

1. Significant loss of containers overboard
2. Numerous damaged and deformed containers
3. Very dangerous situation on deck (shifted, hanging, partially destroyed containers)
4. Necessity of immediate change of route and speed reduction
5. Decision to seek shelter in the nearest suitable port

After evaluation of the situation by the ship's command together with the company, it was decided that continuing the voyage in such condition presented unacceptable risk for the crew, vessel and remaining cargo.

The ship requested and received permission to enter a Spanish port of refuge. Currently specialists from classification society, port authorities, cargo surveyors and stevedoring company are working on board.

Main tasks in port:

1. Detailed assessment of damage
2. Checking vessel stability
3. Safe discharge / repositioning of damaged and dangerous containers
4. Assessment of lashing system condition
5. Developing plan for continuation of voyage

Lessons for seafarers and officers

This case once again very clearly demonstrates several critically important things:

1. Extreme weather margins in container lashing are not as large as many people think
2. Even modern lashing systems can be overwhelmed by really extreme dynamic forces
3. Very early decision to reduce speed / alter course can be decisive
4. Correct assessment of the situation and timely request for port of refuge can prevent much more serious consequences
5. Safety of the crew always has higher priority than commercial considerations

Source: Maritime Executive