He uses a Comstock rig, out of California, on larger baits. That's two hooks at a 90 degree angle on a three-inch stainless steel cable. But he'll use a single hook in a small bait. Sharks aren't as finicky as tuna when it comes to bait. You can sew the rig right to the outside of a silver baitfish with dental floss and a needle.
Sharks go more by smell than sight.
And that leads to another secret he's found. Sharks have a highly developed sense of smell. They quickly know if they're headed away from or toward the source of a chum slick. They can smell in the parts per billion range. And they'll quickly detect the scent of humans after you've handled the bait.