Figure 3. This image was captured by iPUMA, a wide-swath forward-looking sonar used to identify possible targets. Here was see the two wrecks off Prudence Island, as well as features on the surrounding sea floor. For scale, the wooden barge is 120 feet long.Image courtesy of AUVfest 2008: Partnership Runs Deep, Navy/NOAA, OceanExplorer.noaa.gov.