Descend more than 100 feet below the ocean’s surface in air-conditioned comfort aboard this 48-passenger submarine. You’ll see colorful fish, corals, and other marine creatures populating the waters off of Lahaina. Occasionally, eagle rays, white tip sharks, or a rare monk seal will swim past the submerged ship’s windows. Whales have even been known to cruise alongside—filling the cabin with their otherworldly song. One guaranteed highlight is the sunken Carthaginian, a 19th-century replica supply boat that was scuttled to become an artificial reef.