Baku, September 16 (AZERTAC). Several hundred salvage workers will endeavour to right the Costa Concordia wreck on Monday, more than 20 months after the luxury cruise liner crashed into a reef and partially sank. It is a vital but uncertain step in the costliest-ever maritime salvage operation.

Thirty-two passengers and crew members were killed after the 290-metre, 11-storey cruise ship struck a reef off the Italian island of Giglio in January 2012. Francesco Schettino, the ship`s captain, is on trial for abandoning the ship and manslaughter. Four other crew members and a company official have been sentenced to prison.

In January, Franco Gabriele, the head of Italy`s civil protection agency, said the cost of the operation could reach $530 million, up from the $400 originally estimated. More recent estimates put the budget at $825 million.

Based on sea and weather conditions in Monday`s dawn forecast, authorities on Sunday gave the final go-ahead for the ambitious operation in the waters off Tuscany, an engineering feat that has never before been tried in such conditions.

In April 2012, Florida-based Titan Salvage and Italian firm Micoperi were awarded the contract to remove the ship from Italy`s Giglio Island. Work got underway the following month.

The first task was to anchor and stabilize the wreck in order to keep it from slipping further into the sea, making it less dangerous to work on. Workers attached the Costa Concordia to the coastline using four “submarine anchor blocks.”

Other work included building a “false bottom,” or underwater platform, on the seabed below the wreck, which it will sit on once it has been righted. Fifteen steel containers called “caissons” were also installed on the side of the ship that is above water to right the ship.

To cushion the more delicate bow of the ship, crews have cradled it in protective material, a measure likened to putting a protective neck brace around an accident victim before being moved.

Canada will also have its role in the salvage operation. Waterloo-based 2G Robotics is set to deploy its underwater laser scanner next week to provide a detailed picture of the submerged section of the ship. One of the challenges is to rotate the vessel without dragging it lower onto the seabed on which it lies. The platform built onto the seabed below could help reduce that risk, but there`s still a danger the ship could over-rotate off the platform and plunge into the sea. Cables have been connected to the ship`s starboard turrets to help balance it as it rotates.

Another problem, according to the Concordia wreck removal website, is that the force of parbuckling could deform the ship`s hull. And there is a chance the cruise liner could split apart or fall back on its side near an Italian island.

The ship`s unknown condition after it has been soaking in the water for 20 months could also pose as a risk, according to Frank Van Hoorn, senior naval architect of Argonautics, a California-based marine consulting company.