The Santa Barbara Scientist Who Found Poison in the Pacific

David Valentine Discusses Discovering DDT Dumping Ground in Waters off Catalina Island and Charting New Course at UCSB

August 31, 2023
Using a remote-controlled robot, Valentine and his team captured the first images of the barrels resting 3,000 feet below the water’s surface off the L.A. coast. | Credit: Courtesy David Valentine
Using a remote-controlled robot, Valentine and his team captured the first images of the barrels resting 3,000 feet below the water’s surface off the L.A. coast. | Credit: Courtesy David Valentine

Pure DDT — the toxic insecticide banned in the U.S. in 1972 (but still in use in other parts of the world) — is poisoning the marine environment off the Los Angeles coastline near Catalina Island. The harmful chemical has blanketed the seafloor since hundreds of tons of DDT were dumped into the water more than 50 years ago.

UC Santa Barbara scientist David Valentine is the one who discovered the startlingly high concentrations of DDT 3,000 feet below the water’s surface, surrounding an underwater graveyard of leaking barrels filled with unknown chemical substances.

He says that it’s “goo-ifying the junk” of male sea lions (as well as destroying their spines, riddling them with tumors, and killing their kidneys) because of the nightmarish combination of herpes and toxic chemicals such as DDT (dichloro-diphenyl-trichloroethane) and PCBs (polychlorinated biphenyls). 

In fact, the type of urogenital cancer only caused by that horrific duo is responsible for nearly 25 percent of adult sea lion deaths.