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Survey of supposed deep-sea chemical munitions dump off Southern California
Date:12/9/2013

e Santa Cruz Basin, about 110 kilometers (70 miles) southwest of Los Angeles, in water about 1,900 meters (6,300 feet) deep.

In March 2013, MBARI's seafloor‐mapping AUV (autonomous underwater vehicle) spent 18 hours surveying a portion of the Santa Cruz Basin using side-scan sonar. Following a preprogrammed zig‐zag path about 25 meters above the ocean bottom, the AUV surveyed almost 26 square kilometers of seafloor, including areas inside and outside the marked dump site. Within the surveyed areas, researchers counted 754 "targets" (objects sticking up from the seafloor).

Although the AUV sonar surveys allowed the researchers to locate hard objects on the seafloor, they did not provide enough detail so that these objects could be positively identified. To find out what was actually on the seafloor, Brewer's team returned to the Santa Cruz Basin in May 2013 and videotaped the seafloor using one of MBARI's remotely operated vehicles, the ROV Doc Ricketts.

Video from the ROV showed numerous 55-gallon drums in and on the muddy seafloor. Many of these rusting barrels were covered with anemones, sponges, crabs, and other animals. Other targets from the AUV survey turned out to be garbage such as canned goods and cases of bottled water. The researchers also found two small, unarmed drones used by the military for target practice, and a 30‐meter-long steel mast from a ship. In short, the ROV survey turned up all sorts of marine debris, but no chemical weapons.

Based on the results of this partial survey, Brewer and his fellow researchers suggest that not all sites marked as chemical munitions dumps may actually have been used for this purpose. However, their work demonstrates that modern undersea robots, such as MBARI's seafloor‐mapping AUV, are capable of surveying such marked dump areas relatively quickly. Such surveys will help cartographers redraw the lines around these areas, to more accurately reflect what's
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Contact: Kim Fulton-Bennett
kfb@mbari.org
831-775-1835
Monterey Bay Aquarium Research Institute
Source:Eurekalert  

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