The volumearticle by Jared Wicks allows one to read the primary texts. He studies twelve texts before 180 CE and five texts from 180-300. This is very readable and easy to follow. This article can be found online and this will allow you to discovery the complexity of this issue. Here is my brief summary:
All the sources who cite 1 Pet 3:18-20 understand this to mean that Jesus preached his good news in Hades to those who were disobedient during the period when Noah was building the ark. The implied logic appears to be that this group did not have the benefit of a prophet; hence, Jesus offers them a “second chance” to attain salvation.
Nearly all of the Church Fathers have Jesus also preaching to the Jewish patriarchs and prophets. In so doing, Jesus acts in Hades with the same mandate that he had on earth, “Go only to the lost sheep of the House of Israel” (Matt 10:3).
Many emphasize that in the same way that Jesus opened up his apostles to a universal mission to the gentiles, it must be expected that Jesus preached to all the gentiles in Hades as well, going all the way back to Adam and Eve. Clement of Alexandria puts forward the principle that all humans are children of God; hence, just as the Church on earth is reaching out to all the nations, so, too, this same practice would apply to Hades. If Jesus does not do this himself, then it will be the practice of his apostles to do so after they die. This is a big step forward! Now it was not just Jesus but his apostles who were reaching out to the Gentiles while in Hades. Jesus was raised after three days, but the apostles continue their preaching mission for 2000 years.
In the third and following centuries, one can notice a gradual shift toward presenting Jesus as initiating violent action against the god Hades and tearing down the gates of his kingdom. Within this alteration, those who had enthusiastically accepted Jesus' message were enabled to join him in his ascension into heaven. Thus, this enabled the understanding that the saints were no longer "awaiting the resurrection in Hades," but they were passing through Hades and entering heaven shortly after their deaths.
Augustine decided that death had to be the deadline for determining a person’s salvation. Accordingly, Augustine reinterpreted 1 Pet 3:18-20 symbolically as referring to the future salvation that Jesus would bring to the human race. Likewise, Augustine was forced to see Jesus’ time in Hadesidentified "the spirits" as coming after his resurrectionthe humans living prior to the flood who were heralded to by the pre-existent Christ through the person of Noah.
An afterthought: Given the importance of Augustine in the West, Augustine effectively challanged all those who regarded Jesus' preaching as providing a "second chance" at salvation. Only in the Easter Orthodox Churches did the descent of Christ continue to shape their faith and their liturgy. During the Protestant Reformation, the descent of Christ into Hades iswas further challenged because, among Catholics, it iswas being used to support the practice of offering prayers and good works for the poor souls in Purgatory.
For further exploration: https://www.academia.edu/s/b56e1b238f
TheIn the last 120 years, the interpretation of the Sacred Scriptures has attained greater sophistication. When it comes to the interpretation of 1 Peter 3:18-20 as given by, the majority of scholars dedicated to 1 and 2 Peter have concluded that the Church Fathers appearsappear to entirely misunderstandmisunderstood the text.
1 Peter 3:18-22 records Christ’s proclamation to the “imprisoned spirits.” Interpreting this passage has challenged even the most competent exegetes. Earliest interpretations understood these imprisoned spirits as the souls of humans to whom Christ preached during his “harrowing of Hades” between his death and resurrection. Augustine identified them as the humans living prior to the flood who were heralded to by the pre-existent Christ through the person of Noah.