 Although considered to be dormant by volcanologists, Haleakalā is certainly capable of further eruptions.Maui is part of a much larger unit, Maui Nui, that includes the islands of Lānai, Kahoolawe, Molokai, and the now submerged Penguin Bank.During periods of reduced sea level, including as recently as 20,000 years ago, they are joined together as a single island due to the shallowness of the channels between them.