 It consisted of introducing a cloth into the mouth of the victim, and forcing them to ingest water spilled from a jar so that they had the impression of drowning.The "potro", the rack, in which the limbs were slowly pulled apart, was thought to be the instrument of torture used most frequently.Among them all, the "submarino/ waterboarding" was by far the most commonly used, since it was cheap, and seen as "harmless and very safe" (safer for the victim than clothless waterboarding, hence the "improved" ("mejorado") epithet).