Delta EEC, a member of Delta Engineering Group, signed an agreement with the Ministry of Science, Innovation and Technological Development of the Republic of Serbia for expert supervision of the Rakovica Selo BIO4 complex. The first stage includes the following facilities: a checkpoint, a building for experimental animals (vivarium), a refrigerating chamber for animal corpses, a stable, a hayloft, a sheepfold, a manure storage, a levada for horses, silos for storing grain feed, a walking area for sheep, a parking lot and a transformer substation.