HMAS Canberra, a de-commissioned warship is to be sunk as an artificial reef and dive site to join a group of ships sunk from 1900 to 1990. Several WW1 submarines and a couple of genuine wrecks are there too.
http://www.hmascanberra.com.au/wreck-dives.htm
Several links on this site to look at. I used to be a diver but it's been a long time since I ventured beyond snorkel depth.