The Wrecks where purposely sunk to form a sheltered harbour for small boats. Almost all of the wrecks are sitting out of the water. I personally have never found the visability to be too good here, normally around 4-10 metres. The site is subject to current according to tides but is not normally too bad. There is plently of fish life and soft corals.
Moray eels live in and around the wrecks and a few have become quiet used to divers.
Penetration dives are not recommended unless you or your buddy have local knowledge of the wrecks. Kingy rates this spot as Hutchisons Shoals Hutchison Shoals lie 20 minutes North of Flinders Reef. These Shoals have many good dropoffs , caves and deep trenches. It is a very open dive site, so the weather has to be near on perfect to dive here. Just remember only take what you need.