Achievement Exhibition of National Economy ( "Expozitia Realizarilor Economiei Nationale" - EREN ‘64 ). A British Pathe documentary filmed in 1964 in Bucharest. One of the most spectacular exhibits (mostly because of its lighting at night) was 3DH-200A oil rig for deep drilling produced at Plant 1 Mai Ploiesti, located on the platform for the presentation of the oil sector.