How did Peizo meet the Octonauts?

The pitch-black darkness of the deep water pressed down on Peizo—he'd dived before, but never so far from home. The current suddenly yanked him sideways, as if an invisible hand had grabbed him and dragged him into a crevice between the rocks. He tried to turn, to avoid the blow, but he didn't have time: the sharp edge of a rock crunched into his fin, followed by a heavy boulder falling from above, crushing his leg.

Pain flared in a blinding flash, and Peizo screamed, but the sound was instantly lost in the water. He hung there, clinging to the ledge, his fin dangling, nearly torn off, his leg aching so much he wanted to close his eyes and simply disappear. Flakes of silt swirled around him, visibility dropped to a few centimeters, and shadows kept emerging from the darkness—large, unhurried…

"Mh... Ouch! Mh... How painful..." Peizo whispered, although no one could hear him.

His leg and flipper were aching with a throbbing, agonizing pain. His head was splitting—either from the blow or from a concussion. The injured limbs looked utterly rotten: his leg was clearly broken and twisted unnaturally, and his flipper was nearly torn off and also broken. He couldn't move them. Peizo, trembling, glanced at them, trying not to look, but it was no use. A lump crept up his throat, tears welled in his eyes, but he couldn't give in to his emotions: fear and pain paralyzed him, preventing him from even crying.

Suddenly, a bright beam flashed through the murky silt—not natural, not lunar, but artificial, smooth, powerful. It glided across the rock, briefly illuminating Peizo's silhouette, and then vanished. But it was enough: Peizo realized there was someone nearby. Someone with technology. Someone who could help.

The beam returned, grew wider, and silhouettes flickered in it—not predators, not shadows, but figures in diving suits, carrying searchlights and instruments. These were the Octonauts.

"There's someone there!" shouted Captain Barnacles, who was the first to spot Peizo.
"He's wounded!" added Quasi, instantly assessing the situation.

They swam closer, trying not to stir up any excess mud. Peizo wanted to say something, but only a wheeze came out.