Andy gulped. "Uh-oh.
Rock Canyon has strong currents!"
"Don't worry," Cora said.
"I'll find the young angelfish."
Octo wiggled his arms. "Let's go!"
"No. You stay here, Octo," Cora said.
"But I want to come!" Octo said.
"Sorry," Cora said.
"The angelfish might come back.
Please wait here with Andy."
"Okay." Octo sighed. "Can we play tag, Andy?"
Cora and Mo swam fast to the compass.
Inside was a picture of the missing angelfish.
"They're stuck behind a big rock," Cora said.
"We need to rescue them!"
Cora and Mo followed the red arrow.
They swam through a deep canyon.
The current grew stronger.
Rocks tumbled around.
"It's hard to keep swimming!" Mo cried.
"Here, grab my tentacle!" Cora said.
The arrow finally stopped.
It pointed at a huge rock.
"Help! Help!"
Cora heard tiny voices.
She peeked behind the rock.
It was the young angelfish!
"Please help!" one angelfish said.
"This rock trapped us!" the other said.
"Don't worry," Cora said.
"We'll get you out."