The main reason for diving Malpelo Island is the sharks. The area is known for large schools of hammerheads, silky sharks, Galapagos and whitetip sharks. In the winter there is a population of sand tigers, and in late summer and fall, whale sharks call these waters their home. Other large pelagics can also be viewed. Tuna, jacks and eagle rays are not uncommon, with the occasional manta ray making an appearance.
The reason for all of this large life is an abundance of food being brought in by strong ocean currents. So diving conditions are not easy. Currents could be very strong and visibility clouded by all the nutrients in the water. But this is the price to pay for hanging out with the big boys.