According to I Peter 3:18-20, Jesus went into the grave and spoke to the prisoners. (v18) "For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh but made alive by the Spirit. (v19) By whom also he went and preached unto the spirits in prison, (v20) Who at one time were disobedient..."
Which brings up another controversial issue, Judas may have been saved according to Scripture for he confessed and repented before hanging himself! (Matthew 27:3-5) Scripture says "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness." (I John 1:9)
Therefore, (we do not know, but) Judas "could have" been saved! In John 21:22 "Jesus saith unto him, If I will that he tarry till I come, what is that to thee? Follow thou me." and that is what I will do, if God permits!