Strange “Halos” on the Ocean Floor off Los Angeles Reveal a Toxic Secret

Once believed to contain the pesticide DDT, new analysis shows some barrels actually held caustic alkaline waste. In 2020, striking photographs revealed rusted barrels scattered across the seafloor near Los Angeles, capturing widespread attention. At first, the corroded containers were suspected to hold residues of the pesticide DDT, especially since some were surrounded by pale, [...]