But Jack didn't know that it was a whirlpool. He was getting sucked in by the whirlpool, he tried to swim out back to the sand but the deathly water sucked him back in.
He screamed "MUM! MUM!" but Mum was too far away for her to hear him scream.
He closed his eyes and after 10 seconds he opened them. When he opened them he was under water. He held his breath for as long as he could but in the end he couldn't hold his breath any longer. He opened his mouth blowing out lots of bubbles, then he realised he could breathe underneath the surface of the water.