The fragile marineecosystem of the sea floor is a frontier that we know very little about

Where he is famed for his history of the whaler that inspired Herman Melville's "Moby Dick" and for arguing plausibly in his "Sea of Glory" that the ocean, not the West, was America's first frontier.

where he is famed for his history of the whaler that inspired Herman Melville's “Moby Dick” and for arguing plausibly in his “Sea of Glory” that the ocean, not the West, was America's first frontier.