A vibrant exploration of past and present controversies surrounding control of the world's oceans. In 1609, the Dutch lawyer Hugo Grotius rejected the idea that even powerful rulers could own the oceans. "A ship sailing through the sea," he wrote, "leaves behind it no more legal right than it does a track." A philosophical and legal battle ensued, but Grotius's view ultimately prevailed. To this day, "freedom of the seas" remains an important legal principle and a powerfu...