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What great mysteries lurk unseen beneath your very feet? Introducing underground caves, caverns, sinkholes and cities that are hiding ancient secrets... Click to learn more on Dark5.tv, comment on the findings, and suggest more underground places to investigate
The greatest mysteries of this world and beyond...
Dark5 presents top 5 lists of strange science, weird history, conspiracies, cryptids, UFOs, aliens, secret societies, ghosts and mysterious cre...
