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A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.
Melanesia is a subregion of Oceania in the southwestern Pacific Ocean. It extends from New Guinea in the west to Tonga in the east, and includes the Arafura Sea and a few thousand islands. The region includes the four independent countries of Fiji, Vanuatu, the Solomon Islands, and Papua New Guinea. It also includes the French colonial collectivity of New Caledonia and parts of Indonesia – notably the provinces of Papua and West Papua. Almost all of the region is in the Southern Hemisphere; only a few small islands that aren't politically considered part of Oceania—specifically the north western islands of Western New Guinea—lie in the Northern Hemisphere. Countries in Melanesia - Fiji, Vanuatu, the Solomon Islands, Papua New Guinea, New Caledonia.