Immersub was requested to install four new mooring buoys for vessels in quarantine in the anchorage area. Each mooring was composed of four blocks of 5 tons each, and more than 120m of chain on each mooring system.
Using air lifting devices, the team managed to lift each concrete blocks and tow it to the specific location. The blocks were aligned using open bottom parachute bags and the chains were then installed and secured. Once every blocks have been correctly positioned, the team towed the huge mooring buoys to complete the installation. The whole operation required 15 days of work.
- 300 x 45m Japanese Bulk Carrier, MV Wakashio ran aground in the south east of Mauritius - On the 5th August the ship began to break into two parts alongside the reef - More than 1,000 T of heavy crude oil spilled in the pristine lagoon of Pointe D’Esny, resulting in Mauritius worst ever oil spill to date.
- With the help and support of the whole country, Immersub managed to minimize the damages caused to the environment by installing fence booms, absorbent materials, and more than 5km of artisanal booms. - In 4 days and with the coordination of local authorities and the local community, more than 300 tons have been skimmed in the lagoon and placed in IBC tanks. - The clean up operation ended in January 2021.
- Tanker LOA 300m x 45m, fully loaded 22m draft - Crew reported an emergency as major water ingress observed inside Cargo hold #3 - Immersub team inspected the vessel and found 2 cracks of approx 350mm. One of the cracks was found on the turn of bilge.
- Custom cofferdams have been manufactured to adapt to hull curvature and create watertight integrity. - Both inside and outside works have been carried out with certified welders - The tanker was free to sail in 3 days
- 324m Cargo vessel with 21m draft - The vessel reported a crack and water ingress inside water ballast tank #2. After inspection by divers, the team found a crack of 1.73 metres long located on turn of bilge (FWD STBD), with a gap of approx. 20mm. - Further to this major crack, the team also found 5 additional cracks along longitudinal frame 30a.
- A plan was established with Superintendent, Class Surveyor, Chief Engineer and Immersub Dive Supervisor in order to stop water ingress and perform the repairs inside ballast tank and outside on shell plating. - Measurements were taken by diving team for the fabrication of the cofferdam to blank the biggest crack. The cofferdam was installed and Master confirmed watertight integrity, thus allowing the welders to do the repairs inside vessel. - Regarding the 5 additional cracks, arrest holes were drilled to prevent further extension of the crack on shell plating. As requested by the Class, Certified welders filled and welded the crack, and 4 doubler plates were additionally welded on the hull plating to ensure watertight integrity.
- The 12 September 2009 the MV Cemrem reported a major water whilst calling to Port Louis with 300 T of heavy crude oil - The vessel started to severely trim and Authorities requested urgent attendance to avoid an environmental catastrophe
- The diving team inspected the vessel’s hull plating but no signs of grounding or cracks have been noticed - Two sea chests were defective, and it appeared that one of the sea chest valve exploded and caused the water ingress - Immersub team worked together with the shipyard and the authorities to manufacture and install a blanking on the sea chest in order to allow pumping of water inside vessel - 24 hours later the vessel was refloated and a major oil spill was avoided in the Port vicinity.
- Fully loaded fishing vessel 350 GRT - 50m - The vessel caught fire during welding operations by crew alongside Trou Fanfaron Quay. - Port tugs were called for emergency to extinguish the fire. However, this operation rendered the vessel unstable, thus causing a negative stability and the vessel to capesize.
- After the damage assessment was carried out, the team installed a maximum number pumps inside the engine room and the cargo holds. - The same compartments were blanked to ensure watertight integrity. Once blanking operation was completed, all pumps were activated and a constant monitoring by 3 divers was conducted during night and day. - After 14 days of operation, the fishing vessel was refloated alongside the quay. - After 25days of intense work, the container vessel was refloated and towed to the container terminal for permanent repairs.
MSC KATIE: Container Ship 5000 TEU - 232m Container vessel ‘MSC KATIE’ went into collision with an Ice Breaker while coming out of harbour. Luckily the vessel was pulled on time by power tugs on a 12m shole facing Pointe aux Sables, to prevent the latter from sinking with all crew onboard. The collision caused a consequent hole on the starboard side shell plating of the vessel located close to the engine room, resulting in an instant blackout.
- Immersub urgently responded to the emergency situation and carried out the first damage assessment survey. The team found a hole 12mx3m. Measurements of hole and hull curvature was taken in order to fabricate a blank. - A 40ft container was modified and reinforced at shipyard to be used as a cofferdam to blank the hole. - The cofferdam was lowered into the water, floated by lifting bags and towed to casualty for welding. The team carried out the work in collaboration with the shipyard, in confined space and with zero visibility in the engine room. - After 25days of intense work, the container vessel was refloated and towed to the container terminal for permanent repairs.