The live impact range, which is the most contaminated zone, was given the highest protected environmental status, that of a "wilderness preserve." The Fish and Wildlife Service states that Vieques Wildlife Refuge is an ecologically diverse Caribbean wildlife refuge. The EPA has declared the refuge a superfund site. Much of the lands are now termed wildlife refuges, meaning that humans are not allowed on the land, therefore allowing the Navy to avoid cleanup. Whether or not the U.S. made the land a wildlife refuge to avoid cleaning up the island is debated.