Now maybe some Southern Baptists will get the courage of their own convictions:
King Ferdinand declared that drowningcalled the third baptismwas a suitable response to Anabaptists. Water as a form of torture was an inversion of the waters of baptism under the (grotesque) belief that it could deliver the heretic from his or her sins.
In the Inquisition, the practice was not drowning as such, but the threat of drowning, and the symbolic threat of baptism. The tortura del agua or toca entailed forcing the victim to ingest water poured into a cloth stuffed into the mouth in order to give the impression of drowning. Because of the wide symbolic meaning of "water" in the Christian and Jewish traditions (creation, the great flood, the parting of the Red Sea in the Exodus and drowning of the Egyptians (!), Christ's walking on the water, and, centrally for Christians, baptism as a symbolic death that gives life), the practice takes on profound religious significance. Torture has many forms, but torture by water as it arose in the Roman Catholic and Protestant reformations seemingly drew some of its power and inspiration from theological convictions about repentance and salvation.
More blog-commentary here.