Following 'White Helmets' on their rescue missions in Aleppo

Aleppo was once Syria's largest city. But since the war, buildings have become hollowed out shells. There’s rubble everywhere, food is scarce and electricity spotty. There’s the constant threat of bombs falling from Syrian or Russian aircraft. A small group of civilian volunteers called the White Helmets were on the ground to help people buried under the rubble. The documentary “Last Men in Aleppo” follows a few of them.