The octopus peered out of the cave, and the wail came again, buzzing uncomfortably in their heads. And in that moment, Rick's air gave out. He pulled the reserve lever and planed to the surface, Scotty close on his heels.
On the Water Witch they stared at each other.
"Did you hear that?" Scotty demanded.
"I'll say I did!"
"That octopus wailed," Scotty insisted. "Twice!" He hesitated, then put Rick's thoughts into words. "Only—octopuses don't wail. They don't make noise of any kind."
"This one did," Rick said. "A wailing octopus! This is either a new scientific find, or ..."
"Or we've found what the fancy frogmen didn't want us to find," Scotty concluded.