Government agencies like the U.S. Coast Guard and the National Transportation Safety Board conduct investigations of accidents and issue reports based on those investigations. Note the legal constraints on admissibility of such reports in evidence in a court case.
Diamond Offshore Co. v. Survival Systems, International, Inc., 2013 WL 371648 (U.S. District Court for the Southern District of Texas, January 29, 2013). Free copy available here.
American Steamship Co. v. Hallett Dock Co, 2013 WL 308907 (U.S. District Court for the District of Minnesota, January 25, 2013). Free copy available here.