Ninety South. Erevos, #1

Fifteen million years of silence. One drill. A lake the size of an inland sea lies sealed beneath two miles of Antarctic ice - cut off from the sun, the air, and every living thing that came after. Dr. Elin Kavanagh came to the bottom of the world to keep eleven people alive while a drill breached that dark for the first time. What comes up the borehole is pale, patient, and hungry for the one thing it has never known: warmth. Then the storm closes in.
No aircraft flies. No one comes. The heat that keeps the crew alive is the same heat feeding the thing in the water - and the only weapon left is the cold that will kill them just as surely as it kills what they woke. NINETY SOUTH is Book One of the EREVOS series - claustrophobic, isolation-driven survival thrillers where the landscape is the antagonist and the clock is the cold. The ice has a bottom.
The bottom is awake.