The boys, ages 10 to 15 years, form an integrated group and control all aspects of the expedition, from navigation and maintenance to the filming of the voyage. They also write reports for the press, radio and television and produce their own monthly magazine. Many have been on board for at least a year and have taken part in expeditions in the Mediterranean, the Black Sea, the Red Sea and the Atlantic. Using only 19th century navigation equipment, they explore the volcanoes of the Canary Island, go scuba diving in the Caribbean, walk the rain forests of Venezuela, the jungles of Guatemala and even follow the migration of the humpback whales. Other activities include swimming with dolphins, cave exploring and camping out on the remote Canary Islands.