<p>Explore Grand Cayman's underwater world without getting wet while on a 45-minute ride in a glass-bottom boat that cruises over the Cali and Balboa shipwrecks, plus the colorful waterscape of Cheeseburger Reef. Feel the wind whip across your face and the sun shining brilliantly as you glide across bright-blue Caribbean waters on the Oculus, a sightseeing boat equipped with a 10-foot glass viewing window. Hear tales of the Cali, a freighter ship that sprung a leak in its hull while carrying a heavy load of rice — spotted eagle rays and tarpon now swim among its wreckage. You'll then motor overtop the Balboa, a 375-foot ship that sunk in the middle of Georgetown Harbor during a tropical hurricane in 1932. Watch as nurse sharks lurk around its rusted steel remains before heading to nearby Cheeseburger Reef, which got its name due to the proximity of a seaside Burger King restaurant. Watch snapper, moray eels, and butterflyfish flutter around large coral heads submerged 10 feet below the surface, all while getting an up-close view of one of the island's oldest reefs.</p>