Fred Bavendam / West Indian Manatee (Trichechus manatus) named Sadie has propeller cuts on the tail, but her calf remains intact, every year boats kill dozens of manatees, Kings Bay, Crystal River, Florida

David Fleetham / Diver swimming behind the propeller of the wreck of the Hilma Hooker, a 236 foot long cargo vessel that sunk in 1984 off the island of Bonaire in the Caribbean.

Franco Banfi / Yellow sponges (Aplysina cavernicola) on propeller pt the wreck 'Vassilios T', Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Scuba diver exploring Viana wreck, the hull is covered with spiral Tube-worm (Sabella spallanzani). Propeller of Viana wreck, a vessel set on fire in the Horta harbour. In attempt to contain the fire,...

Franco Banfi / Propeller of Viana wreck, a vessel set on fire in the Horta harbour. In attempt to contain the fire, the boat was sunk there. After a few months, the vessel was mended to float and transported to the...

Benoit Stichelbaut / Man working on propeller of fishing trawler "Jack Abry II" in Concarneau dry dock, Brittany, France. June 2007.

Benoit Stichelbaut / Man working on propeller of fishing trawler "Jack Abry II" in Concarneau dry dock, Brittany, France. June 2007.

Benoit Stichelbaut / Placement of propeller on tuna fishing boat "The Drennec" in Concarneau, Brittany, France. July 2006.

Merryn Thomas / Propeller of trawler under construction in boatyard, Essaouira, Morocco. November 2008.

Juergen Freund / Australian sea lion {Neophoca cinerea} swimming past propeller under tourist boat, Fisherman's Island, Batavia Coast, Western Australia 2006

Fred Bavendam / West Indian Manatee (Trichechus manatus) has propeller cuts on the tail, every year boats kill dozens of manatees, Kings Bay, Crystal River, Florida

TOM WALMSLEY / Woman diving and Atlantic spotted dolphin {Stenella frontalis} showing scars from boat propeller injuries Bimini, Bahamas, Caribbean

Onne van der Wal / Man examining the propeller on the hull of a Shannon Shoalsailor. This vessel is a shallow draft beachboat designed to roam shallow waters such as those of Exuma, Bahamas.

Philip Stephen / Trawler propeller and tail-shaft being removed for repair. Peterhead shiplift, May 2005.

Angelo Giampiccolo / Diver and propeller on the wreck of the SS "Thistlegorm", located in the Straits of Gubal, Northern Red Sea. She was sunk by German bomber planes in World War II ^^^and has lain at the bottom of the s...

Onne van der Wal / Yacht propeller covered in barnacles.