Rescue efforts for the missing three have been hampered by the treacherous river, moving swiftly and clogged by downed trees and floating debris from recent storms. Louisville Metro Fire Chief Gregory W. Frederick said the water is moving faster than it has for years, too fast for pleasure boats to travel safely. Nonetheless, Frederick said the fire department was unable to send divers underwater, so had to rely on sonar and sight. On Monday, the fire department transferred command to the Louisville Metro Police Department's dive team, as is customary when a rescue operation becomes a recovery mission. The police department's homicide unit will also conduct an investigation into the crash. A video camera on a downtown building, blocks away, captured the boat as it made the doomed turn across the river, Frederick said. In the video, the boat's light disappears at 9:26 p.m.