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Published February 23, 2015 at 600 × 436 in cargo_dsc0880_jpg
Smithsonian divers explore the hull of a massive cargo ship for biological invasions of organisms that "hitch a ride" on the hull of the vessel. (Photo by Laurie Penland)

Smithsonian divers explore the hull of a massive cargo ship for biological invasions of organisms that “hitch a ride” on the hull of the vessel. (Photo by Laurie Penland)

Smithsonian divers explore the hull of a massive cargo ship for biological invasions of organisms that “hitch a ride” on the hull of the vessel. (Photo by Laurie Penland)

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