You can also find a canyon that leads to a tunnel where you can witness gray reef sharks swimming in and out of the canyon. (divezone.net)
There's a shark dive with gray reefs, but that's just the start. (caradonna.com)
The confluence of currents attracts a large amount of gray reef sharks that patrol above the reef and keep divers adrenaline pumping. (DiveAdventuresAsia.com)