Halibut, an 87 foot USCG Cutter that was involved in interdicting smugglers when Terrell Horne was struck and killed by the boat propeller of a much smaller vessel. Photo courtesy of the U.S. Coast Guard.
Aspects of the Propeller Safety Debate chart
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart