Beneath Rasatala is another planetary system, known as Patala or Nagaloka, where there are many demoniac serpents, the masters of Nagaloka, such as Sankha, Kulika, Mahasankha, Sveta, Dhananjaya, Dhrtarastra, Sankhacuda, Kambala, Asvatara and Devadatta

Expressions researched:
"Beneath Rasatala is another planetary system, known as Patala or Nagaloka, where there are many demoniac serpents, the masters of Nagaloka, such as Sankha, Kulika, Mahasankha, Sveta, Dhananjaya, Dhrtarastra, Sankhacuda, Kambala, Asvatara and Devadatta"

Srimad-Bhagavatam

SB Canto 5

Beneath Rasatala is another planetary system, known as Patala or Nagaloka, where there are many demoniac serpents, the masters of Nagaloka, such as Sankha, Kulika, Mahasankha, Sveta, Dhananjaya, Dhrtarastra, Sankhacuda, Kambala, Asvatara and Devadatta.

SB 5.24.31, Translation

Beneath Rasātala is another planetary system, known as Pātāla or Nāgaloka, where there are many demoniac serpents, the masters of Nāgaloka, such as Śaṅkha, Kulika, Mahāśaṅkha, Śveta, Dhanañjaya, Dhṛtarāṣṭra, Śaṅkhacūḍa, Kambala, Aśvatara and Devadatta. The chief among them is Vāsuki. They are all extremely angry, and they have many, many hoods—some snakes five hoods, some seven, some ten, others a hundred and others a thousand. These hoods are bedecked with valuable gems, and the light emanating from the gems illuminates the entire planetary system of bila-svarga.