Carnival Victory, image courtesy of Wikipedia. Michael Meyer and his wife sailed on the Victory prior to his shore excursion catamaran propeller accident in St. Lucia.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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