The cooling pipes at the Diablo Canyon Nuclear Power Plant were all fashioned from the finest stainless steel. Before they were installed, they were x-rayed, ultrasounded, and pressure-tested to be sure that they could never break, and after being welded into place, the welds were also x-rayed and tested. The radioactive steam from the core left its heat in the pipes, which leached it off into a seawater cooling pond, where it was safely vented to the Pacific. But Diablo had been built on a breakneck schedule during the energy scare of the seventies. The welders worked double and triple shifts, driven by greed and cocaine, and the inspectors who ran the X-ray machines were on the same schedule. And they missed one. Not a major mistake. Just a tiny leak. Barely noticeable. A minuscule stream of harmless, low-level radiation wafted out with the tide and drifted over the continental shelf, dissipating as it went, until even the most sensitive instruments would have missed it. Yet the leak didn’t go totally undetected.

In the deep trench off California, near a submerged volcano where the waters ran to seven hundred degrees Fahrenheit and black smokers spewed clouds of mineral soup, a creature was roused from a long slumber. Eyes the size of dinner platters winked out the sediment and sleep of years. It was instinct, sense, and memory: the Sea Beast’s brain. It remembered eating the remains of a sunken Russian nuclear submarine: beefy little sailors tenderized by the pressure of the depths and spiced with piquant radioactive marinade. Memory woke the beast, and like a child lured from under the covers on a snowy morning by the smell of bacon frying, it flicked its great tail, broke free from the ocean floor, and began a slow ascent into the current of tasty treats. A current that ran along the shore of Pine Cove.