In Tiburon, California, off of Paradise Drive is a public park on the shore of the bay. Lining the shore are these large cement blocks with rusty metal links to attach submarine netting. These were to block the entrance of the bay. This is a left-over vestige from World War II, when there was fear of enemy submarines coming into San Francisco Bay.
One benefit of the submarine nets being removed was that marine mammals started coming back into the bay. These include harbor porpoises, and the occasional humpback whale.
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