Step into Edgar Martins' Time Machine

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Edgar Martins is drawn to documenting off-limits places. This was part of the appeal for him in a project titled 'The Time Machine,' in which he gained access to hydro-electric power plants in Portugal, the country where he was born. Built between 1950 and '70, these facilities were designed to accommodate dozens, even hundreds of employees working side-by-side with state-of-the-art technology. They're now operated with only a handful of personnel and are largely disused. He answered a few questions for us about the project. See gallery