(Reading) book Mr. BIG to the Sharks

At the zoo, Mr. BIG sees seals and sea lions, zebras and even a sea elephant. So there must be a sea pig? At the library, he finds an old, dusty book. It's called 'Rare Sea Creatures'. And in the book he reads: 'The sea pig is a rare sea creature. It lives in the dark deep sea.' So, Mr. BIG builds a submarine and goes on a journey...