This is Steve Saka answering a question about calfrisas, which this is not. This is a curing barn at Oliva Tobacco in Esteli, Nicaragua. A calfrisa is more sealed for more accurate temperature control and quite a bit more expensive to construct making them somewhat rare.
Next he goes on to explain what this difference is between curing, which is what is happening here, and fermentation.
Stay tuned for more tobacco knowledge from Steve Sake and Cigar Safari.