Explore Kauai Scuba is the newest and most unique way to see Kauai from the sea. We offer multiple tours to explore Kauai’s underwater beauty. We travel through ancient lava tubes and meet reef fish found only in Hawaii’s warm Pacific waters. As Hawaii’s oldest island, Kauai’s waters offer Mother Nature’s best handiwork. Life hums and beauty abounds underwater, with only the sounds of your own bubbles.