‘Where is Agartha? What is the specific region in which it lies? Along what road, through what civilizations, must one walk in order to reach it?.’ - Saint-Yves d’Alveydre in 1886 Agartha, the debut full-length album by Japanese producer Wata Igarashi, is a mysterious, divine thing. Named for the mythical secret kingdom, understood as a complex maze of underground tunnels, perhaps designed by Martians who colonised the Earth tens of thousands of years ago, it’s a similarly mystical, perhaps even…