Derek the Dredger is always out at sea searching for sand and gravel that he sucks up with his machine. He takes it back to land where his friends the diggers and trucks use all the sand and gravel to build houses, roads and schools.
Derek, Archie, Marie and Billy work together to ensure that no archaeology -or biology will get damaged and so that Derek will get all the sand and gravel he needs.
Play Hangman, and see how many words you can get right.