When a great river recedes, it does not merely reveal a dry bed — it opens a corridor through time. Along the Danube in northern Bulgaria, a summer drought of historic severity has drawn back the waters to expose mammoth bones, prehistoric oysters, and the sunken wreckage of a world war, inviting ordinary people to walk where only water had passed for centuries. What climate change has taken from the living river, it has momentarily returned as memory — a paradox that scientists, archaeologists, and curious citizens are quietly reckoning with before the waters, if they return, close the archiv