The Hollow: The Echo

When a freak seismic event swallows half their town, five teens find themselves in a vast, hidden world beneath the Earth's crust - a land where dinosaurs never died out and the laws of nature bend in impossible ways.

In the Hollow, danger glows in the dark, nightmares hunt in silence, and the dinosaurs... can talk.
Now bonded with ancient creatures who remember humanity's first sins, the teens must survive a living ecosystem that wants them gone - or changed forever. The only way out is through.
And something else is waking up down here...