Patala facet of Hinduism
In Indian religions, Patala (Sanskrit: पाताल, IAST: pātāla, lit. that which is below the feet), denotes the subterranean realms of the universe – which are located under the earthly dimension. Patala is often translated as underworld or netherworld. Patala is described as more beautiful than Svarga (subtle dimensions, loosely translated as heaven). Patala is described as filled with splendid jewels, beautiful groves and lakes. 
In Vajrayana Buddhism, caves inhabited by asuras are entrances to Patala; these asuras, particularly female asuras, are often "tamed" (converted to Buddhism) as dharmapala or dakinis by famous Buddhist figures such as Padmasambhava.In Hindu cosmology, the universe is divided into the three worlds: Svarga, Prithvi or Martya (earth/mortal plane) and Patala (gross dimensions, the underworld). Patala is composed of seven realms/dimensions or lokas, the seventh and lowest of them is also called Patala or Naga-loka, the region of the Nagas. The Danavas (demon sons of Danu), Daityas (demon sons of Diti), Rakshas and the snake-people Nagas (Serpent-human formed sons of Kadru), live in the realms of Patala.Hinduism
The Vishnu Purana tells of a visit by the divine wandering sage Narada to Patala. Narada describes Patala as more beautiful than Svarga. Patala is described as filled with splendid jewels, beautiful groves and lakes and lovely demon maidens. Sweet fragrance is in the air and is fused with sweet music. The soil here is white, black, purple, sandy, yellow, stony and also of gold.The Bhagavata Purana calls the seven lower regions bila-svargas ("subterranean heavens") and they are regarded as planets or planetary systems below the earth. These regions are described as being more opulent than the upper heavenly regions of the universe. The life here is of pleasure, wealth and luxury, with no distress. The demon architect Maya has constructed palaces, temples, houses, yards and hotels for foreigners, with jewels. The natural beauty of Patala is said to surpass that of Swarga. There is no sunlight in the lower realms, but the darkness is dissipated by the shining of the jewels that the residents of Patala wear. There is no old age, no sweat, no disease in Patala.The Vishnu Purana, states the seven realms of Patala, which are located one above the other, are seventy-thousand yojanas (a unit of measurement) below the Earth's surface. Each of them extends ten thousand Yojanas. In Vishnu Purana, they are named as from the highest to the lowest as: Atala, Vitala, Nitala, Garbhastimat, Mahatala, Sutala and Patala. In the Bhagavata Purana and the Padma Purana, they are called Atala, Vitala, Sutala, Talatala, Mahatala, Rasatala and Patala. The Shiva Purana, replaces Mahatala with Tala. The Vayu Purana calls them Rasatala, Sutala, Vitala, Gabhastala, Mahatala, Sritala and Patala. The seven Patalas as well as the earth above them is supported on the head of the tamasic (dark) form of Vishnu, the thousand-headed nāga Shesha. Sometimes, Shesha is described to reside in the lowest region of Patala instead of below it. Below the regions of Patala lies Naraka, the Hindu Hell – the realm of death where sinners are punished.Different realms of Patala are ruled by different demons and Nagas; usually with the Nagas headed by Vasuki assigned to the lowest realm. Vayu Purana records each realm of Patala has cities in it. The first region has the cities of the daitya Namuchi and Naga Kaliya; in the second Hayagriva and Naga Takshaka; in the third, those of Prahlada and Hemaka; in the fourth of Kalanemi and Vainateya; in the fifth of Hiranyaksha and Kirmira and in the sixth, of Puloman and Vasuki. Bali rules as the sovereign king of Patala.The Bhagavata Purana presents a detailed description of the seven lower realms. A similar description of the seven Patalas also appears in the Devi-Bhagavata Purana.Patala
Patala or Nagaloka, is the lowest realm and the region of the Nagas, ruled by Vasuki (the snake that hangs around Shiva’s neck). Here lives several Nagas with many hoods. Each of their hood is decorated by a jewel, a source of light of which illuminates this realm.
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