Hercules The Harbor Tug Author:Michael O'Hearn In a busy harbor,full of ships, the most important boat is a tugboat. What exactly does a tugboat do? Noah and Tanika find out when they spend an exciting day on the tugboat Hercules. Join them and see the sea gulls, porpoises, seals, barnacles and jellyfish that live in the harbor waters. Watch the work on the big ocean-going tugs, dredgers, an... more »d drydocks. Discover why Hercules tows an oil boom around a sunken ship. At the end of the day, the tugboat captain has a surprise for Noah, Tanika -- and you!« less