A captain assuming a watch immediately after waking led to a tow striking a lock gate in the Gulf Intracoastal Waterway, the National Transportation Safety Board (NTSB) said in its Marine Investigation Report released Tuesday.On March 22, 2021, the towing vessel Ava Claire was transiting westbound pushing two fully loaded tank barges in the Gulf Intracoastal Waterway near Intracoastal City, La.