For the most part, the ocean is a vast pit full of a fat lot of nothing.  How much nothing?  If you set sail from California on a straight path at a cruising speed of 12 mph, you might not hit land or see anything of interest for 22 days.  Underwater is a lot of the same.  When working on an open ocean aquaculture project where we dived in the middle of the ocean twice per day for months on end, most of the dives were in deep, unbroken, gin-clear blue water.  I spent hours looking at nothing...

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