stuff?
by divers and pollution
Because they should
Artificial reefs are important for different aspects such as:For diving trainingEnvironmental education and recreationReef rehabilitationTo protect the marine life
Aqua Kids - 2005 Artificial Reefs was released on: USA: 22 October 2010
fijians grow artificial corals for trade
On balance, good.
They sometimes do cause damage to the reefs, but are not usually to blame for killing entire reefs; that is something that only larger forces can cause, such as climate change or a huge hurricane.
G Word - 2008 Artificial Reefs 1-35 was released on: USA: 1 October 2008
They increase the population of marine life in and near the artificial reef.
Tae In Kim has written: 'Wave forces on submerged artificial reefs fabricated from scrap tires' -- subject(s): Artificial reefs, Fish habitat improvement
So that the divers are able to take pictures, provide research, and monitor the sea life and the changing temperature
Artificial reefs will be covered by corals and other sea life and will become 'natural' eventually. Even a shipwreck will become covered in sea life and become an important sea life habitat.