Here is another account OMJ of maybe ‘subterranean people':

In 1887 near a village called Banjos, in Spain, people working in a field were astonished when they saw 2 children emerge from a cave. What was unusual about the children, was the fact that their skin was bright green and they were wearing strange clothing.

The children were brought to the Justice of the peace, who tried to rub off the green colour from their skin, but discovered it was natural pigmentation. The faces were noted to have African type features, but their eyes were more almond, asiatic looking.
The children also spoke a strange type of language which was not known.

The children would or could not eat the food they were given for 5 days, but then accepted, when offered freshly cooked beans.
The boy appeared very weak and soon died, but the girl survived and gradually her skin colour changed to that of a person of the white race.

She learnt to speak some spanish and what she told the people astonished them even more.

The girl told of the ‘country’ she came from. It was a place of no sun, in a permanent twilight state.The ‘country' was separated by a river from a bright country where the sun shone.
There had been a whirlwind accompanied by a terrible noise, which had lifted the two children and deposited them in a cave, and that is how they came to be there.

The girl survived for another 5 years and then died.