More than 2,600 entries on "every aspect of the seas and the vessels that sail on them, from shipbuilding, yachting, diving, and marine mammals, to tidal power, piracy, and the literature and language of the sea. Also includes topics "such as oceanography and marine archaeology; also included are up-to-the-minute articles on underwater vehicles, tsunamis, warfare at sea, marine pollution, the Economic Exclusion Zone, and ship preservation."