Four girls from the small town of Garabandal, near Santander, had repeated visions of both the Virgin and St. Michael and were given prophecies to disclose to the rest of the faithful. On June 18, 1961, while picking apples at a local orchard, the girls heard a "thunderclap" and saw a beautiful figure enveloped in light which they thought was an angel sent to punish them for stealing fruit. Over the course of the following twelve days, the girls would have visions of the same angel, dressed in blue and with pinkish wings, whom they took to be St. Michael the Archangel. The angel told them that they would soon be seeing the Virgin, and they did so after the eight visitation. The Blessed Mother appeared in garb that would be immediately recognizable to any school-age child in a Catholic country: a white dress with a blue mantle, a starry crown, and a scapular at her waist. The heavenly patroness told the girls to inform their elders that sacrifice and penance were in order to avert imminent punishment.
The thousands gathered in Garabandal to see the miracle were hoping for something more substantial, however, and in the wee hours of October 19, 1961 those present saw the famous miracle of the communion wafers manifesting itself on Conchita's opened mouth (and of which photographs have been reproduced in countless journals and religious tracts).
Garabandal's "dark side" -- if it can indeed be said to have one -- came about a few months earlier when theologian Luis Andreu lost his life in a car crash. Andreu had seen the four girls in their ecstatic trances and had been forced to proclaim aloud the miraculous nature of what he was seeing. When asked exactly what the miracle was, he told his friends that he was overwhelmed with joy at what the Virgin had shown him and that it was the happiest day in his life. Shortly after, he fell silent, much to the concern of those around him. The priest had died. When news of Father Andreu's death reached the young visionaries, they claimed that they had seen the Virgin looking at him at one point, as though saying: "you shall soon be with me". The death of this respected religious caused the bishopric of Santander to forbid members of the clergy from visiting Garabandal without permission from Church authorities. Worshippers were advised that they too must cease their visits, and the tide of pilgrims to the mountain village was stemmed for a while. But there was another death in the works... In 1965, Monsignor Vincente Puchol assumed the bishop's crook at Santander and was even more stringent in his prohibitions against any veneration of Garabandal, issuing a terse pronouncement:
"there has never been any apparition of the Blessed Virgin, nor of the Archangel Michael, nor of any other heavenly personage. There has been no message, and all of the events which have transpired at said location have a natural explanation." It was this rejection of the miracle of Garabandal that many believed cost the bishop his life: he died while driving his car, allegedly screaming "God, what's wrong with me?!" before the collision.
The car crash occurred on the same day as the feast of St. Michael the Archangel. Another (here) Jesuit father, Jozef Warzawski, wrote a comprehensive study on the phenomenon entitled El Mito de Garabandal (Madrid: Ed. Studium) accepting the reality of the events which occurred at the site but ascribing them all to demonic forces.
Link (here) to Conspiracy Journal 617