You could ask your relative, what does he know about theories re. hydrogen-reach nucleus and mantle of our planet.(He`ll be surprised…probably
)
Larin V.N. states that hydrogen from depth of our planet could provide humanity with very cheap, sustainable, and clean environment-friendly energy for hundreds of thousands years presumably. Recently he discovered some locations that are very reach in hydrogen seepage:” We estimated a daily hydrogen flow seeping out at the surface is between 21,000 and 27,000 m3 in one of these structures.”
http://link.springer.com/article/10.1007/s11053-014-9257-5
He works tenths of years in this topic as a scientist, researcher and geologist too.
I find his book very interesting ( free to read):
http://hydrogen-future.com/images/Larin-1993.pdf