Hades. Yep. Remember Jesus telling the man on the cross who asked Jesus to not forget him that he will see him in paradise that day? Hades then was divided by a huge chasm. On one side was paradise, the other a place you didn’t want to be. Here all who died before Jesus went. They obviously were not Christians, Jesus wasn’t even born yet. So Jesus spent the 3 days in Hades. We know he went to the paradise side because of his statement to the man on the cross, unknown if he went to the other side. Here he preached. Witnesses in Israel reported seeing people who had died. Hades was being closed. It was finished. If you want specific records of the events, use your search engine.