The desperate search for earthquake survivors in Turkey and Syria entered its final hours Monday as rescuers using sniffer dogs and thermal cameras surveyed pulverized apartment blocks for any sign of life a week after the disaster.

Teams in southern Turkey’s Hatay province cheered and clapped when a 13-year-old boy identified only by his first name, Kaan, was pulled from the rubble. In Gaziantep province, rescue workers, including coal miners who secured tunnels with wooden supports, found a woman alive in the wreckage of a five-story building.

Stories of such rescues have flooded the airwaves in recent days. But tens of thousands of dead have been found during the same period, and experts say the window for rescues has nearly closed, given the length of time that has passed, the fact that temperatures have fallen to minus 6 degrees Celsius (21 degrees Fahrenheit) and the severity of the building collapses.

The 7.8 magnitude earthquake and its aftershocks struck southeastern Turkey and northern Syria on Feb. 6, reducing huge swaths of towns and cities to mountains of broken concrete and twisted metal. The death toll has surpassed 35,000.