Olly loves cleaning the water in the Chesapeake Bay where he lives with all his friends. But when Olly spies a sunken ship just beyond the oyster reef, he decides to explore the old wreck to see if there is treasure on board. Journey under the Chesapeake Bay with Olly and his friends to learn why his oyster reef is all the treasure he needs. Beautiful illustrations enhance this educational tale about the value of oyster reefs. Subject categories include: Environment & Ecology, Water Books, Oceanography, Marine Life, Science & Nature, and Friendship. Pre-K to grade 3.