500,000 Barrels of DDT in the Sea: Interview with documentary directors on California coast crisis − Mongabay

“Out of Plain Sight,” directed by journalist Rosanna Xia and filmmaker Daniel Straub, documents the legacy of mass amounts of DDT waste dumped off the California coast decades ago, with environmental consequences continuing today….
It’s not just toxic chemicals. Radioactive waste was also dumped off Los Angeles coast – the Los Angeles Times

For decades, a graveyard of corroding barrels has littered the seafloor just off the coast of Los Angeles. It was out of sight, out of mind — a not-so-secret secret that haunted the marine environment until a team of researchers came across them with an advanced underwater camera…Startling amounts of DDT near the barrels pointed to a little-known history of toxic pollution…but federal regulators recently determined that the manufacturer had not bothered with barrels. (Its acid waste was poured straight into the ocean instead.)…