In appearance, it is based on the Abyss in John Milton's "Paradise Lost".

Entity and relation annotations:
id: 0
type: entity
value: text: John Milton
labels: <Person>
id: 1
type: entity
value: text: "Paradise Lost"
labels: <Work_of_art>
id: 2
type: entity
value: text: the Abyss
labels: <Location>
type: relation
to_id: 1
labels: Person:creates:Work_of_art
from_id: 0