In the process of accessing hidden levels of SIGMA, users would also learn the truth about six UFO-related mysteries that have been the subject of controversy: Area 51, Roswell, Majestic 12, NASA, Kenneth Arnold and The Arkansas Incident (on which Season 1 is based).
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The score features a number of unusual instruments including ondes Martenot, Cristal Baschet and Glass Harmonica played by French virtuoso musician Thomas Bloch plus a twelve piece choir, live string section, piano, guitars and basses often heavily treated and manipulated with electronic effects.