Avīci

Avīci or Avici (Sanskrit and Pali for "without waves"; or ; or ) is one of the hells (naraka) in Buddhism and later Hinduism. The term In Buddhism, is in reference to what is perceived as the lowest level of the Naraka or "hell" realm, with the most suffering, into which the dead who have committed grave misdeeds may be reborn. It is said to be a cube 20,000 yojanas (240,000 to 300,000 kilometers) on each side, buried deep underneath the divine (nonvisible) earth. Avīci is often translated into English as "interminable" or "incessant", referring to suffering without periods of respite, although it is believed to be ultimately impermanent. Also, in Hinduism, it is one of the twenty-eight hells located in the kingdom of Yama, where individuals are reborn for bearing false witness and outright lying while transacting business or giving charity.
Avīci-punishable offenses/transgressions
There are various evil acts which can lead one to being committed to the torments of . People reborn in have generally committed one or more of the Five Anantarika-karma ("Grave Offenses"):
Intentionally killing one's father.
Intentionally killing one's mother.
Killing an arhat (enlightened being).
Shedding the blood of a Buddha.
Creating a schism within the sangha (the community of Buddhist monks, nuns, and laypeople who try to attain enlightenment).
Details about Avīci
Buddhism teaches that going to Naraka is temporary, allowing the offenders to work off the karma they garnered in life. is sometimes cited as lasting 3.39738624×1018 or 339,738,624×1010 years, about 3.4 quintillion years.
The Lotus Sutra provides an example of humans who have to endure long-term suffering in . Some sutras state that rebirth in will be for innumerable kalpas (aeons). When the offending soul passes away after one kalpa, it is reborn in the same place, suffering for another kalpa, and on and on until it has exhausted its bad karma. For this reason, the hell is also known as the "nonstop way".
Nichiren famously wrote that Buddhist monks who ignored the passages in the Lotus Sutra, which claimed superiority over other sutras, would fall into . Outside of Nichiren, it is extremely rare for a Buddhist monk to condemn anyone to , although the Lotus Sutra itself states of anyone who slanders it: "when his life comes to an end, he will enter the Avichi Hell."
Some believe rebirth in (or any lower realm, for that matter) should be seen as a process of purification. If anyone correctly follows the teachings of Buddha, they will be able to attain enlightenment without going to any hell even if they have accumulated a vast amount of negative karma (excluding Anantarika-karma).
There are many stories of people who have accumulated negative karma but avoided all the levels of Naraka because they attained enlightenment before their karma ripened, this should not be taken as the means is a justification for the ends but by doing one pure act of kindness can eradicate all past discretionary behaviour. If one has Anantarika-karma, he will not be able to attain enlightenment in this life because this negative karma will ripen immediately.
Buddhism accepts the principle of anattā, according to which there is no concept of self. Consequences are results of actions that are brought by in an impersonal manner described with the concept of karma. There is no supernatural being applying its own will to determine someone's fate: "[...] beings are owners of kamma, heir to kamma, born of kamma, related through kamma, and have kamma as their arbitrator. Kamma is what creates distinctions among beings in terms of coarseness & refinement."
References
Locations in Buddhist mythology
Buddhist cosmology
Naraka