Below the murky, rolling currents of the Detroit River is a floor loaded with centuries of artifacts: war cannons, old wooden ships, cars and hundreds of firearms, ranging from wooden muskets to automatic handguns.
Visibility is so poor that scuba divers make many of these discoveries by running their hands along the river bottom. City ordinance forbids the public from diving in the river within Detroit city limits -- partly because of safety concerns, and partly because there's so much cr
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