Around 1 p.m. today, the D.M.R. boat was traveling up and down the west side of the bridge taking the scan of debris. The D.M.R. believes it to be the left over concrete from the old Biloxi Bridge that was destroyed by Hurricane Katrina. D.M.R. spokeswoman, Melissa Scallan, says the results of the scan should be ready by Thursday after the D.M.R. takes more pictures on Wednesday. Scallan says, "Today, we took our sonar out to the debris at the Biloxi Bay Bridge to see how big of a field of debris that's there and see exactly what it is, so that will determine what it’s going to take to remove it."