Fatima: The Last Great Vision 1929 in Tuy, Spain

O most holy Trinity, Father, Son and Holy Ghost, I adore Thee profoundly. I offer Thee the most precious Body, Blood, Soul and Divinity of Jesus Christ, present in all the tabernacles of the world, in reparation for the outrages, sacrileges and indifference by which He is offended. By the infinite merits of the Sacred Heart of Jesus and the Immaculate heart of Mary, I beg the conversion of poor sinners. (Third Angel apparition, Fatima, 1916)

One of the most important of all the revelations of Fatima, is the last great vision in 1929. It appears to be a synthesis of the entire message.
This vision was unknown to the world until a few years ago when, for the golden jubilee of Fatima, it was revealed by Diocesan authorities. Previously it had been made known only to Pope Pius XII in a personal letter.
In her own words, Lucia describes the vision:

Suddenly the whole Chapel was illumined by a supernatural light, and a cross of light appeared above the altar, reaching to the ceiling. In a bright light at the upper part of the cross could be seen the face of a man and his body to the waist (Father) on his breast there was a dove also of light (Holy Spirit) and, nailed to the cross, was the body of another man (Son). Somewhat above the waist, I would see a chalice and a large host suspended in the air, on to which drops of blood were falling from the face of Jesus Crucified and from the wound in His side. These drops ran down on to the host and fell into the chalice. Our Lady was beneath the right arm of the cross (... it was Our Lady of Fatima with Her Immaculate Heart... in her left hand... without sword or roses, but with a crown of thorns and flames...). Under the left arm of the cross, large letters, as of crystal clear water which ran down over the altar, formed these words: Graces and Mercy.
I understood that it was the Mystery of the Most Holy Trinity which was shown to me, and I received lights about this Mystery which I am not permitted to reveal.
Our Lady then said to me:
The moment has come when God asks the Holy Father, in union with all the Bishops of the world, to make the Consecration of Russia to my heart, promising to save it by this means.

Imprimatur + JOHN, Bishop of Leiria, Leiria, April 26, 1968 - Blue Amy of Our Lady, Washington, N.J., 07882