1 Enoch 6–15 describes how the sons of God (called “Watchers” in that ancient book) who committed the offense of Genesis 6:1–4 were imprisoned under the earth for what they had done. That imprisonment is behind the reference to the “spirits in prison” in 1 Peter 3:19.2 Recall that the prison to which the offending divine beings were sent was referred to as Tartarus in 2 Peter 2:4–5.
