Water does not have to be very deep for one to find sharks because they can also be found in shallow water, but in rare cases. It is hard to determine the exact depth of water that sharks are found but an animal expert will be able to help you out.
My favorite subject that I study alot about! Sharks will be in very shallow water. I mean you can go out in knee deep or shallower than that. Alot of sharks breed at the surface. There's alot of food for them at the surface. Some shark species have their pups in the shallow. Wherever there is activity in the water than you might see a shark at!