"The huge shadow they saw was a ship! An enormous cargo ship. Sammy freaked out. “What is that?” The ship was sinking down toward them, spewing bubbles and making the water all murky and oily.
“It’s a ship!” cried Shelly.
“Swim!” screamed Sharkie. And they all swam as fast as they could into a pitch black cave. The ship sank to the seafloor and waited"