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A DM friend of mine did that on a dive in Thailand and sure enough we we being circled by a couple of reef sharks in minutes. One even came in for a closeup.Mike Veitch:we use a small water bottle. Take it to depth then fill it half full with water, you will need to use your octo to get some of the water out... then cap it..
then squeeze it vigourously!
Oh yeah, that methods has worked for me as wellBill51:The only foolproof method of attracting sharks is when your camera batteries go dead.