Pentecost Island is a lush mountainous, tropical island stretching over 37 miles from north to south. It was named after the day on which the first European, Louis Antoine de Bougainville, sighted it on 22 May 1768. There are no towns on Pentecost - most of the islanders live in small villages and grow their own food in small gardens. Local traditions are strong, including the age-old ritual of land diving. This unique ritual was first given international exposure by David Attenborough in 1960. Later, in the 1980s, New Zealander AJ Hackett used the idea to invent bungee jumping. Every harvest season from April to June, the people of southern Pentecost construct the towers around a lopped tree, using saplings and branches held together with forest vines. It can take up to five weeks to complete. Each young man who jumps must carefully select his own liana vine. Men and boys as young as seven jump from platforms at different heights (between30 and 90 feet) with only those vines attached to their ankles. The intention is to touch the ground with their heads or shoulders. This ceremony is believed to ensure a good yam harvest. It is also a fertility rite for men.