I'm too tired to read all of this now - but it looks absolutely fascinating.

Off the Face of the Earth

IT WAS THE ONLY REFUGE THEY HAD LEFT. In 1942, as the Nazis intensified their hold on Eastern Europe, several Jewish families disappeared into the vast underground labyrinths of western Ukraine. The group ranged from grandmothers to toddlers, and for the next year and a half they lived, worked, ate, and slept in caves directly under the feet of those who would send them to their deaths. Their story is one of history's most remarkable epics of survival. And yet it was almost forgotten until an American caver came across the remnants of their underground asylum and set out to find the survivors of PRIEST'S GROTTO.

Link courtesy of Nextbook.