The Catholic Creed states
” ... He descended into Hell. On the third day he arose again ... “
It doesn’t say what He did during those days in Hell.
As children in Catholic school, we were taught that he was meeting and freeing those souls there.
No, it doesn’t say what he was doing, the Bible says he was dead. What do the dead do? “Sleep” said Jesus when he went to awaken, resurrect, his friend Lazarus.