& # 39; The world’s largest semi-submersible cruise ship out of the water
Whatever floats on your boat! & # 39; The world's largest semi-underwater lifts lifts an entire cruise ship out of the water so that it can be repaired in a stunning 12-hour operation
- The £ 185 million BOKA Vanguard is & # 39; the world's largest semi-submersible dry dock and can carry large ships
- Crew on board the BOKA Vanguard can flood its ballast tanks and sink the deck 52 feet below the surface
- The sinking deck allowed the crew of the 345-meter cruise ship to enter Carnival Vista BOKA Vanguard
- After emptying the ballast tanks, the BOKA Vanguard brought the Carnival Vista back to the port for repair
These amazing images show & # 39; the world's largest semi-submersible boat pulling a 4,000 passenger cruise ship out of the water so engineers can make repairs – without the ship having to find a dry dock large enough to accommodate.
The BOKA Vanguard was commissioned by the owners of the Carnival Vista cruise ship that had technical problems and needed urgent repairs. However, because the cruise ship was in the Bahamas, it was difficult to find somewhere where it could be repaired and was out of service for a long period of time.
Instead, the huge semi-submersible boat flooded its ballast tanks to sink its deck, allowing the 345-meter-long cruise ship to position itself in the hull.
The pictured BOKA Vanguard is & # 39; the world's largest semi-submersible dry dock that can carry a cruise ship
A dug is used to pull the Carnival Vista, pictured in position in the hull of the BOKA Vanguard, pictured
The BOKA Vanguard can flood its ballast tanks and sink its deck more than 50 feet in front of the surface, allowing the 345-meter-long Carnival Vista to be pulled into position to lift out of the ocean
The BOKA Vanguard then emptied its ballast tanks and lifted the cruise ship out of the water before taking it to the port where repairs could be completed.
According to Maritime Executive, it took 12 hours for the BOKA Vanguard to restore the huge cruise ship.
With speeds up to 14 knots (16 mph) during unloading, the ship can still reach up to 13 knots (15 mph) when carrying an oil rig or similar load.
When it reaches its destination, the Vanguard submerges again before it drives off.
The ship can also act as a floating dry dock with which other ships and floating drilling rigs can be taken out of the water for maintenance or inspection without being towed and taken out of service for months.
In the summer of 2013 it was used as a dry dock for the semi-submersible drilling platform Noble Paul Romano when there were no dry docks large enough for rigging in the large port of Valletta off the coast of Malta.
The watertight deck ensures that water can flow safely over the deck and, when immersed, the deck is up to 52 ft (16 meters) below the surface.
In a 12-hour process, the BOKA Vanguard pumps out its ballast tanks to lift the huge cruise ship out of the water
The Vanguard has a value of $ 240 million (£ 184.5 million) and was built by Hyundai Heavy Industries in 2011 before being baptized in November 2012.
Large steel plates were made in a factory before being transported to different yards to be prepared for the ship.
They were then shipped to a construction dock where the Vanguard began to take shape.
The ship is powered by four main engines that drive two adjustable propellers (CPP) and, located on the side of the deck, the Vanguard has a bridge, lifeboat area and living quarters that can accommodate a crew of 40.
The ship was designed by the Dutch holding company Dockwise, which was previously known as the brain behind the Blue Marlin, another semi-submersible heavy lift ship, which is now the third largest of its kind.
And it was almost used to take the Costa Concordia to an Italian storage room in October 2013. The cruise ship landed and in January 2012, turned over Isola del Giglio, Tuscany, and killed 32 people.
But although a deal of £ 23 million ($ 30 million) with Royal Boskalis Westminster was announced, the ship was reshaped and towed to be scrapped in Genoa in July 2014.
Once safe on board, the BOKA Vanguard can take the Carnival Vista to the port for repair
The Carnival Vista developed technical problems in the Bahamas & there was no suitable dry dock available for the ship, which can carry 4,000 people on a cruise
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