[SirJohnBarleycorn]

Researchers found the underground "ocean" while scanning seismic waves as they passed through Earth's interior.

Would be interesting to read an account of the adventures of the researchers as they passed through the Earth's interior. Must have been quite a trip.

[SunkenCiv]

http://www.gutenberg.org/etext/18857

http://www.gutenberg.org/etext/19513