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In 1843, botanist and explorer Joseph Hooker visited the island. Four years later, Hooker, with much encouragement from Darwin, advised the Royal Navy that with the help of Kew Gardens, they should institute a long term plan of shipping trees to Ascension. The planted trees would capture more rain and improve the soil, allowing the barren island to become a garden. So, from 1850 and continuing year on year, ships came each depositing a varied assortment of plants from botanical gardens in Argentina, Europe and South Africa. By the late 1870s, Norfolk pines, eucalyptus, bamboo, and banana trees were in lush profusion at the highest point of the island, Green Mountain, creating a tropical cloud forest.[7]

In 1899, the Eastern Telegraph Company (now part of Cable & Wireless Worldwide) installed the first underwater cable from the island, connecting the UK with its colonies in South Africa.[3] In 1922, Letters patent made Ascension a dependency of Saint Helena.[3] The island was managed by the head of the Eastern Telegraph Company on the island until 1964 when the British Government appointed an Administrator to represent the Governor of Saint Helena on Ascension.[3]

During World War II, to supply and augment extensive amphibious aircraft antisubmarine patrol operations ongoing from the early days of the war, the United States built an airbase on Ascension Island, known as "Wideawake",[3] after a nearby colony of Sooty Terns (locally called 'Wideawake' birds because of their loud, distinctive call, which would wake people early in the morning). The airbase, which was under construction by the 38th Combat Engineer Battalion of the Army Corps of Engineers, was unexpectedly visited by two British Fairey Swordfish torpedo planes on 15 June 1942. According to one of the pilots, Peter Jinks, the planes were fired upon before being recognised as allies. The Swordfish had to land on the unfinished airstrip, thus becoming the first land based aircraft to land on Ascension Island proper — which had long served as an ASW base for Catalina (PBY Catalina) flying boats. The event was later commemorated with a postage stamp 15 June 1982.

The Airfield was used by the US military as a stopping point for American aircraft crossing the Atlantic Ocean on the way to theatres of operation in Europe and Africa. American bombers based at Wideawake were engaged in the Laconia incident. After the end of World War II, and American departure, the airbase fell into disuse.