Christ's descent into hell

"A thing is said to be in a place in two ways. First of all, through its effect, and in this way Christ descended into each of the hells, but in different manner. For going down into the hell of the lost He wrought this effect, that by descending thither He put them to shame for their unbelief and wickedness: but to them who were detained in Purgatory He gave hope of attaining to glory: while upon the holy Fathers detained in hell solely on account of original sin, He shed the light of glory everlasting.

"In another way a thing is said to be in a place through its essence: and in this way Christ's soul descended only into that part of hell wherein the just were detained. so that He visited them "in place," according to His soul, whom He visited "interiorly by grace," according to His Godhead. Accordingly, while remaining in one part of hell, He wrought this effect in a measure in every part of hell, just as while suffering in one part of the earth He delivered the whole world by His Passion."

~St. Thomas Aquinas: Summa Theologiae, III, q. 52, a. 2.

Resurrection of Christ and the Harrowing of Hell,
by unknown Russian icon painter.
Egg tempera on wood, 1500-10; Ikonen-Museum, Recklinghausen.