Jesus...
he descended into hell;
on the third day he rose again from the dead;
“Hell” means very different things before and after Jesus....
Jesus is the judge of the living and the dead. Before Jesus, “hell” means the state of existence for all who died. Or, before Jesus, the dead went to hell. (YES, Moses and Elijah are exceptions — they are the two who appeared speaking with Jesus at the Transfiguration. And, there may have been others....)
Jesus went to hell and, as St Peter express it, preached to the people who had died so they had a chance to hear the Good News and be saved.
Afterward, hell is a state of existence where the soul is eternally separated from God and His love.
Physically speaking, someone can be in the Church, praying his rosary, even receiving the Eucharist, and be separated from God’s love. Not a pretty thought — but pray for the conversion of the living — now, once dead, it’s too late.....