If you are considering the Great Barrier Reef in Australia then you have a lot of options in one of the best marine parks around. Although I agree a lot of Asia is wonderful illegal fishing etc. does tend to reduce considerably the amount of marine life you can see.
Her its protected.
The best trips are those that leave twice a week to the far north Ribbon Reef area (includes the Cod Hole) and Coral Sea where you can do shark feed dives. E.g. Mike Ball and Spirit of Freedom.
Closer to Cairns is the Outer reef.
See here for more info of the trips and feel free to PM me if you need more details as I am based in Cairns
Her its protected.
The best trips are those that leave twice a week to the far north Ribbon Reef area (includes the Cod Hole) and Coral Sea where you can do shark feed dives. E.g. Mike Ball and Spirit of Freedom.
Closer to Cairns is the Outer reef.
See here for more info of the trips and feel free to PM me if you need more details as I am based in Cairns