Yes, there are probably caves on the Moon

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By Leonardo Carrer et al, Nature Astronomy. 

Summary: Beneath the islands of Hawaii, there are systems of underground tunnels forged by fire: lava tubes or ‘pyroducts’ created by the islands’ volcanoes. ...New analyses suggest similar cavern networks born from moving magma exist on the Moon, and someday, ...may host life—ours. ...armed with newer analytical methods, researchers decided to re-examine data the Lunar Reconnaissance Orbiter’s miniature radio-frequency instrument collected a decade and a half ago. The pattern in the radar reflections from the Mare Tranquillitatis pit—one of the best contenders for a cave entrance discovered to date —indicate that a network of caves does indeed lie below. “The most likely explanation for our observations is an empty lava tube,” said co-author Leonardo Carrer in a statement. ...Given that the lunar surface is blasted by solar and cosmic radiation, anyone spending time on the Moon will need a base that’s well-shielded—and an empty lava tube might just fit that bill.... 

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