Recently, according to CBS, for many years, some waters near the coast of California have been seriously polluted.
Due to the long-term dumping of toxic waste into the sea, the ecological environment of the relevant sea areas has been seriously adversely affected, and marine life has also been dealt with a devastating blow.
It is reported that about 25% of adult sea lions in the area have cancer, and pollutants such as the pesticide DDT are the main causes of cancer.
Before DDT was banned, an American company put toxic waste in barrels and threw it into the deep sea during production.
Using underwater cameras, the research team captured dozens of rotten barrels on the deep seabed between Long Beach and Santa Catalina Island.
Contaminants may have leaked long ago, and inferred that there may be as many as 500,000 barrels on the deep seabed.