(Mongabay) A year since the sinking of the cargo ship the X-Press Pearl, Sri Lanka continues to clean its beaches of the plastic pellets that the vessel was carrying, and still trying to claim compensation for the environmental damage wrought.

An expert committee investigating the extent of damage to the country’s marine and coastal environment has now concluded the disaster to be the worst in terms of chemical and plastic pollution of the sea. That’s according to Ajith de Alwis, co-chair of the X-Press Pearl damage assessment committee and a professor of chemical and process engineering at the University of Moratuwa.

The committee has submitted its assessment report to the Attorney General’s Office for use in claiming compensation from the Singapore-based operators of the ship.

“However, the report is only the first edition of the damage assessment, and further assessments would continue based on the monitoring,” De Alwis told Mongabay.

Maritime law expert Dan Malika Gunasekera said Sri Lankan authorities have taken a long time to file for compensation and are reluctant to go through years of strenuous legal battles in international courts. Sri Lanka has obtained an interim payment of $3.7 million in damages, but the country could claim as much as $5 billion to $7 billion, according to Gunasekera.

With Sri Lanka currently mired in the worst economic crisis in the country’s history, those higher numbers would prove a much-needed injection of foreign currency. But further delays would diminish the cash-strapped island’s chance of getting sufficient compensation for the environmental damage, Gunasekera told Mongabay.

X-Press Pearl was carrying 1,486 containers when it caught fire off Colombo on May 20, 2021, and began sinking. Eighty-one of the containers were labeled hazardous, and the cargo included 25 metric tons of nitric acid — a key ingredient in the production of explosives, and touted as a possible factor for the fire. There were several explosions, and it took more than a week to bring the fire under control. Attempts to tow the vessel to deeper waters failed, and the freighter finally sank on June 2, 2021, a few kilometers off Sri Lanka’s western coast.

The ship was also carrying 400 containers of nurdles, the plastic pellets from which all manufactured plastic goods are made. The spill of the more than 50 billion pellets made this the worst plastic marine pollution event in the world, with the pellets quickly spreading along the beaches of Sri Lanka’s western coast.

The government carried out an initial cleanup of the beaches, but subsequent cleaning was done by volunteers like the Pearl Protectors, a youth organization.

“We had 28 major cleaning operations on main beaches and could collect as much as 1,500 kilograms [3,300 pounds] of nurdles,” said Muditha Katuwawala, coordinator of the Pearl Protectors.

But more nurdles keep washing up on the beaches, and with the island currently experiencing the southwest monsoon, nurdles that had initially sunk to the seabed or were trapped in underwater structures such as corals have been washed free and are making landfall.