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Retired Capt. Lawrence Brennan, a professor of international maritime law at Fordham University in New York, said even spraying water on a ship fire can be risky: If any aluminum on board melted on plywood the combination could create aluminum carbide, which, in turn, can generate a flammable methane when sprayed with water.

Among those which stretch along the river for several miles are to be found those interested in the manufacture of carborundum, aluminum, carbide, graphite, caustic potash, muriatic acid, emery wheels, railway supplies, hook-and-eye fastenings, and shredded wheat, which are of special interest to the visitor.