From lava flows of the past, Kona diving is now blessed with a wide array of underwater lava tubes, archways, and caverns.   For those who like to explore the nooks and crannies for crabs, shrimp, living shells, nudibranchs, and other intriguing critters, or for those who just like to experience some of Madam Pele's underwater creations (Hawaii's volcano goddess), these structures offer an unforgettable adventure.