Where is Christ after he dies on Friday afternoon and before he rises on Easter Sunday? Both Scripture and Tradition answer this question. Consider the following from a Second Century Sermon and also a mediation from the Catechism of the Catholic Church.
An Ancient Sermon:
Today a great silence reigns on earth, a great silence and a great stillness. A great silence because the King is asleep. The earth trembled and is still because God has fallen asleep in the flesh and he has raised up all who have slept ever since the world began. . . He has gone to search for Adam, our first father, as for a lost sheep. Greatly desiring to visit those who live in darkness and in the shadow of death, he has gone to free from sorrow Adam in his bonds and Eve, captive with him – He who is both their God and the son of Eve. . . “I am your God, who for your sake have become your son. . . I order you, O sleeper, to awake. I did not create you to be a prisoner in hell. Rise from the dead, for I am the life of the dead.” [From an Ancient Holy Saturday Homily ca 2nd Century]
Consider also this from the Catechism which I summarize and excerpt from CCC # 631-635
[The] first meaning given in the apostolic preaching to Christ’s descent into hell [is] that Jesus, like all men, experienced death and in his soul joined the others in the realm of the dead. But he descended there as Savior, proclaiming the Good News to the spirits imprisoned there.[Acts 3:15; 1 Peter 3:18-19; Romans 8:11; 1 Cor 15:20; Heb. 13:20] Scripture calls [this] the abode of the dead, to which the dead Christ went down, “hell” – Sheol in Hebrew or Hades in Greek – because those who are there are deprived of the vision of God.[1 Peter 3:18-19] Such [was] the case for all the dead, whether evil or righteous, while they awaited the Redeemer: It is precisely these holy souls, who awaited their Savior …whom Christ the Lord delivered when he descended into hell.”[cfPsalms 89:49; 1 Sam. 28:19; Ezek 32:17ff; Luke 16:22-26] Jesus did not descend into hell to deliver the damned, nor to destroy the hell of damnation, but to free the just who had gone before him. [So] the gospel was preached even to the dead. The descent into hell brings the Gospel message of salvation to complete fulfilment. This is the last phase of Jesus’ messianic mission, a phase which is condensed in time but vast in its real significance: the spread of Christ’s redemptive work to all men of all times and all places, for all who are saved have been made sharers in the redemption. Christ went down into the depths of death so that “the dead will hear the voice of the Son of God, and those who hear will live.”[1 Peter 4:6] Jesus, “the Author of life”, by dying destroyed “him who has the power of death, that is, the devil, and [delivered] all those who through fear of death were subject to lifelong bondage.”[John 5:25; Mt 12:40; Rom 10:7; Eph 4:9] Henceforth the risen Christ holds “the keys of Death and Hades”, so that “at the name of Jesus every knee should bow, in heaven and on earth and under the earth.”[Heb 2:14-15; Acts 3:15]
For this is why the gospel was preached even to the dead that, though condemned in the flesh in human estimation, they might live in the spirit in the estimation of God. (1 Peter 4:6)