Speaking of the internet, the term takes on a literal meaning in the realm of cyberculture. The "Underworld" of the web refers to the deep web and dark web—the unindexed parts of the internet inaccessible through standard search engines.
: Takes place in a future where humans have discovered both species and are conducting a "Purge" to eradicate them. Selene discovers she has a hybrid daughter. Underworld: Blood Wars (2016) underworld torrent