Though declared a national park in 1935, the first management plan (by CONAF) was not implemented until the 1980s. As a result of inadequate funding, conservation was initially at a low level leading international conservation agencies to provide financial and technical support. Chile responded by setting up a Rapa Nui Monuments Board which enabled actions to be taken independent of the government. The World Monument Fund started working here in 1968 with UNESCO later recognizing the site as a World Heritage site of cultural importance. With an airline operating (the airport built in 1965 was expanded in 1985) between Chile and the island, more scientists have become interested in island's heritage, undertaking research on various aspects of its now defunct culture.