The Mantawolf drone submersible has returned from its survey of the Devil's Teeth, an oceanic canyon of towering thermal vents teeming with alien life. Within its cargo, a cache of samples, an insidious stowaway lurks: a powerfully transformative organism. Chief Science Officer Liana Pearson along with her crewmate Kate Barron race to study the Mantawolf's alien bounty while the crew grows increasingly restless when the Absolution's nuclear power core begins to behave erratically — Breathe Deep!