Daily Star's biggest headlines straight to your inbox!Researchers venturing into a winding lava-tube cavern home to hyenas for thousands of years made an extremely gruesome discovery, a mountain of munched human bones and animal carcasses.A lava tube is an underground passageway carved by rivers of lava that can reach temperatures of up to 2,000 degrees, once the flow subsides they can leave tunnels exceeding 40 miles.Researchers found the gruesome mountain in Saudi Arabia's Umm Jirsan lava tube, which is thought to be the longest network of its kind in the country, measuring 4,900 feet long and around 26 to 29 feet.The "extremely dense accumulation of bones" was found on the lava tube's western passage.Over 1,900 were analysed by.
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