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The Agua Negra Pass (Spanish: Paso de Agua Negra) is a pass over the Andes mountains which connects Argentina and Chile. The highest point of this pass is at AMSL. ==Agua Negra Tunnel== To improve trade between Chile and Argentina, a 14 km, three-bore vehicular tunnel (two for traffic and one for ventilation〔) below the pass is planned, which will allow year-round traffic.〔(【引用サイトリンク】title=Agua Negra Tunnel )〕 (The pass is closed for much of the winter.) In March 2015, Argentina officially approved the project. It is awaiting ratification from Chile. Also planned for the deepest part of the tunnel is the Agua Negra Deep Experiment Site (ANDES):〔(【引用サイトリンク】title=The ANDES laboratory: Proposed laboratory design )〕 an underground laboratory. Because all currently operating deep underground laboratories are located in the Northern Hemisphere, a Southern Hemisphere site would have some unique benefits: * Combined with existing neutrino detectors, a longer baseline would allow more accurate localization of sources in neutrino astronomy, and * When searching for dark matter, there is expected to be a seasonal variation due to the Earth's orbital motion. But such a signal could also be an error, caused by some subtle seasonal effect. Conformation from a location with opposite seasons would rule out such an error. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Agua Negra Pass」の詳細全文を読む スポンサード リンク
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