Soon, ten minutes passed.

Andrew watched the surface with growing anxiety since nothing stirred, and he worried that Shiloh might be in real trouble after going down alone. He checked the cave again and confirmed there was no exit except the underwater passage.

"If that's the only way out, then I'll have to go down too," he mumbled.

Gritting his teeth, he also plunged into the water. This time, he made a small precaution: he wrapped a length of tough waterweed around his waist.

The cave