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Summary
The Analog-Video Signal Display Unit, or AVSDU, was a sonar repeater installed near the USS Greeneville's periscope platform. On the day of the accident with Ehime Maru, the AVSDU was not working. (U.S. Navy photo)
The Analog-Video Signal Display Unit, or AVSDU, was a sonar repeater installed near the USS ''Greeneville's'' periscope platform. On the day of the accident with ''Ehime Maru'', the AVSDU was not working. (U.S. Navy photo) Source: http://www.ntsb.gov/pu
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