In 1915, Edgar Rice Burroughs wrote a fantasy series of novel,
Pellucidar. In his imagination, Burroughs created a fictional imaginary
world, named Pellucidar. It is fictional 'hollow earth' invented by the
author, reachable through polar tunnel. Edgar has made the story of
inner world, inner sun, primitive civilization etc. realistic and
believable. Pellucidar has primitive culture and inhabited by
pre-historic creature including dinosaurs. Author depicts David Innes's
and Abner Perry's struggle to free humanity from the Mahar tyranny.
David Innes come back to Pellucidar in search of his friend Abner, as
well as his love, Dian. He deals with the disputes following their
initial discovery of Pellucidar, and challenge for the new, human
civilisation.