Reduce your vertical profile in the water; crouch down on or near the bottom or orient yourself horizontally in the water column (sharks often seem more unnerved by height than length - perhaps because the vast majority of creatures it encounters are longest horizontally, in the direction of travel.
Avoid clustering with other divers (sharks often seem to perceive tightly packed groups of divers as a single, large, and altogether frightening super-organism). Remain close enough to your buddy to maintain safety, but relatively far away from other such buddy pairs. Leave solo diving with sharks to the professionals.
Try humming quietly into your regulator (almost any tune with a simple but not-too-regular rhythm works pretty well .Or try clinking two rocks together or clanging the butt of your dive knife against your scuba tank - these simple techniques are sometimes quite successful in luring a curious shark closer to investigate. If you have a brightly-colored camera housing or reef gloves, they may also help pique a shark's curiosity - but do not attempt to gesture while wearing such gloves: they may look edible to a shark.
Enjoy it man....take care
