Dropped off boat onto reef and descended down wall to about 20m. Saw a beautiful Eagle ray – came real close. Then, above us 2 manta rays cruising the reef! Dropped a bit lower to 30m and then… a school of hammerhead sharks. Too many to count – must have been more than 30 in the foreground and shadows beyond. We finned towards them but they went away. Finned back to the wall and finished dive in the shallows with huge turtles, white tips, a lovely clown trigger fish, trevalies and loads of reef fish. Amazing Dive!!