The word "hell" in this text is very unique because it is translated from a word that is used nowhere else in the Bible. The Greek word "Tartaroo" is certainly not the same as the "Gehenna" hell, which is referred to 12 times in the New Testament--always as a place of burning. There is no burning where the angels are confined, because it is described as a place of "darkness."

In Jude verse 6 also, the fallen angels are said to be "reserved in everlasting chains under darkness unto the day of judgement." Please notice that these evil spirit beings are not now being punished, but are kept in darkness, reserved until the day of judgement. Both Peter and Jude speak of chains of darkness and future judgement. Since evil angels are obviously still functioning in deceiving people, we can only conclude that these chains of darkness are the spiritual restraints placed upon their activities until their final judgement and punishment at the end of the world.