Norah is a mechanical engineer aboard a large structure surrounding the Kepler ocean drill, which is in the business of penetrating the Earth’s crust searching for minerals like a hungry anteater. She’s a cynical sort of savior, scooping spiders from the sink, but she knows how to make the tough decisions too. When the structure is rocked by several massive jolts, she’s forced to sacrifice a couple of colleagues while sealing off a passageway to save the whole ship. Soon it’s just a small group of survivors, hoping to make their way down to the ocean floor and across to another drilling station, the Roebuck. It seems their vulnerable suits and the deadly pressure from the miles of water they’re under will be the most dangerous thing to navigate, but they’re of course underestimating the real threats of what lie beneath.