Deep Trouble II

Billy Deep and his sister, Sheena, are spending another summer in the Caribbean on their uncle's totally cool floating lab. The weather is beautiful and there are lots of neat places to go and swimming and snorkeling. Both are good swimmers but even great swimmers get into trouble especially this year. This year, there's something really scary under the sea. The fish all seems to be growing bigger and bigger into monster-sized sea creatures with monster sized appetites.