A suspected toxic spill in Russia's Far East has killed 95% of marine life on the seabed

An aerial view of the suspected spill of an unknown toxic substance off Russia's Kamchatka Peninsula.

(CNN)A suspected toxic spill along a beach on Russia's Kamchatka Peninsula has killed 95% of marine life on the surrounding seabed, local scientists have said, following a weeks-long campaign to investigate the mysterious incident.

Local surfers were the first to spot that something was wrong at Khalaktyr beach after about 20 people in a surf camp experienced severe retina burns and symptoms similar to food poisoning.
In early September, the water changed color to a greyish-yellow, with a thick milky foam on the surface, and a strong foul smell filled the air. A few days later, octopuses, seals and other sea creatures began to wash up on the beach.
    The local authorities at first dismissed the reports. But amid mounting pressure, Russia's Investigative Committee Wednesday launched a criminal probe into suspected violations in the use of environmentally hazardous substances and waste and marine pollution.
    In a meeting with Kamchatka Governor Vladimir Solodov, local scientists reported that the majority of marine life on the seabed was dead.
    "On the shore, we did not find any large dead sea animals or birds," scientist Ivan Usatov said according to a report posted on the governor's official website. "However, when diving, we found that there is a mass death of benthos [bottom-dwelling organisms] at depths from 10 to 15 meters -- 95% are dead. Some large fish, shrimps and crabs have survived, but in very small numbers."
    Large amounts of dead molluscs and other marine creatures were found onshore in the area of Khalaktyr beach.
    The scientists said they believe the contaminated area is much larger than the parts they examined and that the remaining marine life is under threat due to lack of any sustenance left for them to survive on.
    A photographer who participated in the underwater expedition with the scientists also experienced a retina burn, the report added.
    The findings concur with earlier accounts from locals posted on social media.