Net Zero in Atlantis. Net Zero, #11

Ariel and Jenna's escape from the Mysterious Island is only the beginning. The simulation, once thought to be controlled, has evolved-rewriting its own code, bending its world to new rules. Now, they're being sent back in. but not to the island. The island is gone, swallowed by the sea after a cataclysmic volcanic eruption. They barely survived, rescued by Captain Nemo aboard the Nautilus, now bound for the legendary lost city of Atlantis, deep beneath the Aegean Sea.
They're not alone. Iris joins them-wings folded, eyes watching. Their mission: face a new enemy. The Kaigan. Regenerating, relentless, nearly impossible to kill. There's only one sure way to stop them. Decapitation.