The SS Francis Preston Blair was an American Liberty Ship that got stranded on Saumarez Reef in the Coral Sea during a cyclone in 1945. The shipwreck was used as target practice during the 1980s. Its bronze propeller was salvaged sometime between 1964 and 1970. Asbestos is dangerous when it becomes airborne; breathing in or swallowing asbestos fibers is what leads to a host of life-threatening diseases.
Friable asbestos materials are those that can be easily crumbled by pressure no more than hand pressure; no tools required. Although bonded asbestos products do not normally release any asbestos fibers into the air and are considered very low risk, there is potential for damaged products to become friable thereby creating the risk of releasing asbestos fibers into the air.