Photo: Chris Carlson (AP) A research vessel launched this week is on an urgent mission to map out damage from a long-overlooked crisis on the ocean floor, and they’re putting robots to work to help. Advertisement In October, people living on Santa Catalina Island, which sits 22 miles (35 kilometers) off the coast of Southern California, were shocked to learn from a Los Angeles Times investigation that a scientist had found leaking barrels of dangerous waste strewn across the ocean floor. Residents had heard rumors that the nation’s largest DDT manufacturer, which was based in Los Angeles until 1982, had disposed of some of its waste product near the island, and a huge Superfund lawsuit in 2000 had confirmed the company had disposed waste into sewers that ran into the ocean. But records unearthed by the Times confirmed that the manufacturer had filled up a ship with barrels of DDT-tainted waste and dumped it off the coast once a month for almost 40 years, something unaddressed in the Superfund lawsuit.