The Bay is always busy. The container ships go north to Philadelphia? full and come back south empty. They compete for right-of-way with sailboats and small motor boats. When the Container Boats go by, they push a large volume of water out of the way and waves come rushing onto the stony shore. After they pass, they suck a great volume of water back into the bay, and the water from the shoreline recedes alarmingly. I imagine that the same sort of phenomenon happens with the air, but it isn't made evident in quite the same graphic way. 

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