San Onofre beach in California is a popular destination for beachgoers, and beneath the surface is 3.6 million pounds of nuclear waste left over from nearby reactors that were disengaged decades ago.

Southern California Edison (SCE) owns the reactors and has been cited in the past for leaking radioactive waste and falsified firewatch records. They shut down the plant permanently in 2013.

The waste in question is located just 100 feet from the shoreline, near faults that experts say could lead to 7.4 magnitude earthquake. Other threats include corrosion and leaks. In the past, SCE has been granted flexibility on certain rules on the site.

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