Extended Horizons dives the Lana’i coastline in small groups of 11 or less. Lanai is famous for it’s Cathedral Dives, swim-throughs, archways, and lava structures. We dive both First and Second Cathedral on a regular basis. Many divers agree that Lanai diving has the greatest diversity and marine life density, to rival all other diving locations in Hawaii.This is a two tank boat trip. We do two dives, at two locations. There are over 40 dives sites to choose from, ranging from beautiful coral reefs, to unique lava tubes, making these dives the best of your vacation!