Chapter 21

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The air bubble worked perfectly to Adelle's relief. Adelle, Sabine and Mark (who was smirking as if saying "Who is the best?" at her) swam down to the bottom of the pond.

"Here's the tunnel." Mark said, pointing at the dark cave. "Whoooooo creepy," Sabine said, stretching her neck to peer at the underwater tunnel. "Yeah, right?" Mark said, smiling. "C'mon, let's go." he said. And swam headfirst in the tunnel and the unknown danger.

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