Stone Age humans sheltered in lava tube caves in the Arabian Peninsula to escape heat.

Unprecedented evidence suggests Stone Age humans sheltered in lava tube caves in the Arabian Peninsula to escape heat and harsh weather conditions. Neolithic herders occupied vast subterranean tunnels where molten lava once flowed millions of years ago, providing cooler air as a respite from the sun and wind. These inhabitants left behind objects and carved pictures on rocky walls, according to a study published in PLOS One.