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Sonar Images Reveal Extent of Underwater Damage
The U.S. Army Corps of Engineers (USACE), Baltimore District has released the first underwater sonar images of the collapsed Francis Scott Key Bridge. The imagery, supplied by the the U.S. Navy’s Naval Sea System Command’s (NAVSEA) Supervisor of Salvage and Diving (SUPSALV), were captured using an underwater imaging tool known as “CODA Octopus,” which will help guide divers using real-time 3D sonar due to the reduced visibility of the water.
“With visibility clouded to just one to two feet because of the four to five feet of mud and loose bottom of the Patapsco River… divers must be guided via detailed verbal directions from operators in vessels topside viewing real-time CODA imagery,” USACE Baltimore wrote on X.
https://gcaptain.com/baltimore-bridge-salvage-and-wreck-removal-megathread/?subscriber=true&goal=0_f50174ef03-822c5a8a16-170709583
The Patapsco River where the bridge collapsed is approximately 50 feet deep. That's about all I know.