This is a symbol of baptism, which now saves you-- not the putting away of the filth of the flesh, but the answer of a good conscience toward God, through the resurrection of Jesus Christ,
1 Peter 3:18-22 contain some very difficult exegetical problems. Who are the spirits who received a proclamation (1 Peter 3:19)? When did Jesus make this proclamation? What was its content? Why did Peter mention Noah? In what sense does baptism save us?