If we study the Srimad bhagavatam, that is far more ancient than the Bible, the description of Hell is much more detailed and explained. Also eternal in Hell means there is not Sun or Moon, a clock, so people there don't have the sense of day or night, no sense of time, thus seems eternal - but it is not.
SB 5.26.37: My dear King ParÄ«ksÌ£it, in the province of YamarÄja there are hundreds and thousands of hellish planets. The impious people I have mentioned — and also those I have not mentioned — must all enter these various planets according to the degree of their impiety. Those who are pious, however, enter other planetary systems, namely the planets of the demigods. Nevertheless, both the pious and impious are again brought to earth after the results of their pious or impious acts are exhausted.
SB 5.26.6: The King of the pitÄs is YamarÄja (the Lord of Death), the very powerful son of the sun-god. He resides in PitrÌ£loka with his personal assistants and, while abiding by the rules and regulations set down by the Supreme Lord, has his agents, the YamadÅ«tas, bring all the sinful men to him immediately upon their death. After bringing them within his jurisdiction, he properly judges them according to their specific sinful activities and sends them to one of the many hellish planets for suitable punishments.
SB 5.26.7: Some authorities say that there is a total of twenty-one hellish planets, and some say twenty-eight. My dear King, I shall outline all of them according to their names, forms and symptoms. The names of the different hells are as follows: TÄmisra, AndhatÄmisra, Raurava, MahÄraurava, KumbhÄ«pÄka, KÄlasÅ«tra, Asi-patravana, SÅ«karamukha, AndhakÅ«pa, KrÌ£mibhojana, SandamÌÅa, TaptasÅ«rmi, VajrakanÌ£tÌ£aka-ÅÄlmalÄ«, Vaitaraṇī, PÅ«yoda, PrÄnÌ£arodha, ViÅasana, LÄlÄbhaksÌ£a, SÄrameyÄdana, AvÄ«ci, AyahÌ£pÄna, KsÌ£Ärakardama, RaksÌ£oganÌ£a-bhojana, ÅÅ«laprota, DandaÅÅ«ka, AvatÌ£a-nirodhana, ParyÄvartana and SÅ«cÄ«mukha. All these planets are meant for punishing the living entities.
EX: SB 5.26.11: In this life, an envious person commits violent acts against many living entities. Therefore after his death, when he is taken to hell by YamarÄja, those living entities who were hurt by him appear as animals called rurus to inflict very severe pain upon him. Learned scholars call this hell Raurava. Not generally seen in this world, the ruru is more envious than a snake.
SB 5.26.12: Punishment in the hell called MahÄraurava is compulsory for a person who maintains his own body by hurting others. In this hell, ruru animals known as kravyÄda torment him and eat his flesh.