At 785 meters (2,575 feet) depth, remotely operated vehicle Deep Discoverer encountered a World War II-period causeway called a “rhino barge.” Rhino barges were large floating platforms comprised of joined-together steel pontoons that could transport vehicles and supplies to beaches. This is one pontoon.

At 785 meters (2,575 feet) depth, remotely operated vehicle Deep Discoverer encountered a World War II-period causeway called a “rhino barge.” Rhino barges were large floating platforms comprised of joined-together steel pontoons that could transport vehicles and supplies to beaches. This is one pontoon. Image courtesy of the NOAA Office of Ocean Exploration and Research, Deep-Sea Symphony: Exploring the Musicians Seamounts.

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