After an exhaustive historical investigation into the barrels of DDT waste reportedly dumped decades ago near Catalina Island, federal regulators concluded that the toxic pollution in the deep ocean could be far worse ... than what scientists anticipated. In internal memos made public recently, officials from the U.S. Environmental Protection Agency determined that acid waste from the nation's largest manufacturer of DDT " a pesticide so powerful it poisoned birds and fish " had not been contained in hundreds of thousands of sealed barrels. Most of the waste, according to newly unearthed information, had been poured directly into the ocean from massive tank barges. Other chemicals " as well as millions of tons of oil drilling waste " had also been dumped decades ago in more than a dozen areas off the Southern California coast. "That's pretty jaw-dropping in terms of the volumes and quantities of various contaminants that were dispersed in the ocean," said John Chesnutt ... who has been leading the EPA's technical team on the investigation. "This also begs the question: So what's in the barrels? There's still so much we don't know." These revelations build on much-needed research into DDT's toxic " and insidious " legacy in California. As many as half a million barrels of DDT waste have not been accounted for in the deep ocean. Women face greater risk of obesity, earlier menstruation and possibly breast cancer if their grandmothers were exposed to DDT during pregnancy, researchers say.