A navy frigate named Haerlem Wreck was scuttled in Algoa Bay to form an extra artificial reef.

The Haerlem is a navy frigate, scuttled in 1987 to form an artificial reef for diving. It lies close to Bell Bouy. A fascinating wreck, allowing the diver to explore various holes, nooks & crannies which have become inhabited by shysharks, nudibranchs, soft corals and a variety of fish.

History: The Haerlem was built in 1958 and disarmed in 1963. After many years of hard work, first as an anti-submarine ship in the River Thames and later as an SA Navy survey ship in all of South Africa's waters, the ship was finally scuttled in Algoa Bay on Nov 30, 1987. 12 Holes were blasted in both sides to ensure she filled with water equally and setteld evenly. She settled 21m below the surface facing north-south with her bow to the south.