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09 of 10. Manta Rays are the largest of the rays and are related to sharks. Fortunately the Manta Ray does not present a danger and spends its days and nights swimming through the ocean feeding on plankton and small fish. For the Manta Ray dive, powerful lights are placed on the seafloor at about 35 feet. The light attracts plankton which attracts Manta Rays. Various dive shops in Kona do the Manta Ray dive every night, so Manta Rays usually show up for the relatively easy meal.