The most expensive salvage operations in maritime history were also the most complex undertakings in the industry, which required advanced engineering, specialised equipment and planning to the last detail. For the past several decades, many shipwrecks have led to salvage operations that made headlines not only because of the challenges the cases presented but also due to the whopping costs of the endeavours. This article examines the most expensive salvage efforts, delving into the intricacies of these events, their environmental considerations, and financial implications. 1. The Costa Concordia Parbuckling Operation Luxury Cruise Ship Costa Concordia ran aground off Giglio Island on January 13, 2012, leading to the most expensive salvage operation ever. It also led to 32 deaths, including 27 passengers and 5 crew members. A member of the salvage team also died during the rescue operation. Image Credits: Wikipedia The vessel salvage included the use of 48 main cables, 22 hydraulic pumps and dozens of divers, making it a feat of marine engineering. For two years, an underwater platform was drilled into the seabed, involving the drilling of 17 massive holes, welding 30 buoyant steel sponsons to both sides of the ship and deployment of strong hydraulic strand jacks over 19 hours to upright the 114,500 tonne cruise ship in September 2013. After being refloated, it was towed to Genoa in 2014 for dismantling. The project cost touched approximately US$1.2 to 2 billion, covering vessel salvage and environmental cleanup, including the removal of fuel to protect marine life. 2. MV Golden Ray Wreck Removal The MV Golden Ray was a 200 m long roll-on/roll-off car carrier that capsized in St. Simons Sound, Georgia, on September 8, 2019. It was loaded with around 4200 vehicles and had 3000 gallons of fuel, which posed significant environmental risks. This led to a swift response, and due to the presence of soft silt, it was almost impossible to refloat the vessel. The salvage team, led by T&T Salvage, used the heavy-lift catamaran VB-10,000. The team cut the wreck into 8 sections using a heavy-duty anchor chain, a task which took weeks due to several difficulties like chain breakages, thick steel at places like the engine room, hurricanes, extreme tides, etc. Eventually, the ship was declared a total loss and removed as scrap. Image Credits: Wikipedia Some sources stated that the costs of the operation reached US$850 to 1 billion, making it the second most expensive salvage operation. The fuel, which had been mixed with water, was removed from the ship, and a floating barrier was installed to prevent hydrocarbons or debris from spreading. However, by 2022, contamination became a concern, and several fishing communities filed lawsuits claiming that oil, debris and car parts continued to pollute the seabed and the waters. This wreck removal operation is the largest of its type as it took more than 3 million man-hours for cutting, lifting and transporting the wreckage. 3. Project Azorian This was a secret operation to recover the sunken Soviet submarine K-129 from the floor of the Pacific Ocean in 1974. It aimed to use the salvaged submarine to gather intelligence on soviet submarine technologies, especially their nuclear missiles and other equipment. This operation, conducted under the guise of an undersea mining operation, used a purpose-built vessel Hugher Glomar Explorer. Image Credits: Wikipedia Several technological advancements were made, includi