Wednesday, 26 September 2018


Case Study : Capsizing of Costa Concordia


It’s said that history often repeats itself . After 100 years from 1912 when the Titanic met its unfortunate fate a similar incident happened with a famous cruise ship making it second in the line of the most infamous shipwrecks.

The ship Costa Concordia was operated by the notable Italian cruise line Costa Conciere which was established  in 1854.Since the year 1947 when the company commenced passenger services it has established a good reputation over the years and ultimately became one of the largest cruise operators in the world. 

However the capsizing of one of its star cruise ships barely 7 years in service not only left a dent on the company’s reputation but also raised serious concerns over international cruising.

Concordia in its final position
(Source: Google Images)

The following article sheds light on  the reasons behind the capsizing as well as lists out the circumstances that led to the disaster.

The Accident


On the night of January 13 , 2012 Costa Concordia struck her port side on an underwater reef near the Italian island of Isola del Giglio .The ship immediately lost all propulsive power and soon after there was a complete blackout as water reached the electrical panels .The breach resulted in a 60 meter long gash in the ship’s hull.This led to the rapid flooding of the watertight compartments and ultimately led to its capsize.

It's difficult to comprehend the fact that such an incident can happen given the availability of advanced technology and instrumentation giving precise and detailed information of every possible circumstance a ship may face. From rough seas to mapping of the ocean floor to high speed winds ; all relevant data is available with a ship at regular intervals. The topography of any area in which the ship sails forth is already available on board a ship.

 Despite all this the ship Costa Concordia struck an underwater reef off the coast of the Italian Island Isola del Giglio and grounded ,finally resting on the rocks near the coast.

What went wrong that night?


 A big question arises as to why was the ship sailing so near the coast in the first place which ultimately led to one of the most horrifying disasters in international cruising.

Most cruise ships perform what is called as a Sail - By Maneuver. The ship takes a slight deviation from its official course to sail near an island just to give the passengers a unique glimpse of it and give a nod to the fellow sailors on land. This is a routine maneuver in cruise lining and has been practiced successfully across the world for years. The ship's deviation course is plotted in such a way so that it is at a minimum safe distance from the island to prevent any situation of grounding in shallow waters or due to the presence of rocks and reefs near the coast. Concordia had earlier also performed it for the same island in its past voyages .

 So what possibly went wrong this time endangering the lives of around 4000 people on board which would ultimately change the cruising industry forever.


Planned Route with Deviation. Red Line shows the route followed by Concordia 
                         on the day of disaster (Source: Wikipedia)


Concordia’s deviation course required it to stay at least 1500 ft away from the island. But as it turned out the ship landed up around 659 meters closer to the coast. This egregious error due to a series of miscommunications between the captain, first officers and the officer at helm is reflected later in the investigative report. 


Comparison with route for the same maneuver performed in 2011(Source: Wikipedia)


Because of the incorrect heading angles , the turning radius of the ship was much wider than it was supposed to be as per the chartered deviation ; ultimately bringing the ship in close proximity to the shore.

Path showing Collision and Grounding
(Source:Wikipedia)


By the time the captain realised the situation and started giving a series of orders for rudder turns it was too late as the ship was already in too close proximity and moving at a speed of 16 knots. The erroneous executions of order by the helmsman and delay in correcting them ultimately left Concordia no chance to pass safely.

Why couldn't the flagship liner maintain its stability?


So why did such a big and modern cruise liner could not maintain its stability and capsized within an hour of the initial impact. 

The 60 meter long gash in the ship's hull allowed seawater to rush inside the watertight compartments at a very fast pace , ultimately flooding 4 of the compartments.

 Whenever a compartment is flooded the buoyancy provided by that compartment is lost. To maintain its stability the ship 'sinks' more on to that side to achieve the required buoyant force to support its weight. As water keeps on flooding the buoyant force is progressively lost and the ship keeps sinking. The change in the transverse center of gravity due to the addition of water lists the ship.

The ship initially listed to the port side and after making a 180 degree turn it listed rapidly to the starboard side finally resting on the shoreline rocks at an 80 degree angle. Whether the ship was deliberately grounded by the captain to avoid complete sinkage in deep waters or it naturally drifted towards the coast due to the underwater currents and winds is still debatable. But the fact that Concordia partially sank resulted in less number of casualties than the case had it sunk completely. 


Timeline of the Disaster( Source : Wikipedia)


Aftermath


The disaster was declared a total loss for the ship which costed around 570 million dollars .The salvage operation alone costed a massive 1.2 billion dollars thus resulting in a total loss of around 2 billion for Carnival Cruises.The wreck was finally gutted and sold for scrap.
The starboard side of the ship was completely crushed under its own weight
(Source: Wikipedia)


Thus human error once again led to a disastrous ramification in the 21st Century just like it happened in the 20th Century with RMS Titanic.The sinking of Concordia pointed out some pretty gaping holes and incompetency of some of the crew members on board.In its annual report Carnival Cruises reflected the annual losses incurred due to the sinking of Concordia. Better safety procedures and robust techniques must be adopted to regain the trust of people willing to go on board cruises and enjoy cruising in the most spectacular way.


Article By - Shivansh Singh





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