As an excavator claws at the shattered remains of yet another home in Syria's rebel-held northwest, Abdel Qader Abdelrahman surveys the debris in the hope of spotting people who might - against all the odds - still be alive underneath.
The former school principal joined the White Helmets in 2022 as a medic, drawn to its humanitarian mission through a 12-year war that has carved Syria into cantons held by rival armed groups.
