Ukraine's expanding drone web

There's a lot of drone warfare footage on the internet from Ukraine and Russia. But over the last year, a surprising change has emerged, via photos from the battlefront posted online. It has become clear that a huge part of the drone war, from dropping grenades on soldiers in bunkers, to dropping explosives on infrastructure or airfields, is wired. Those wires are fiber optic cable, stretching from drone operators to the drones, which spool out cable across the ground and over trees along the battlefront. These drones are often single-use rarely returning from the mission they set out on. And the spools of fiber optic cable, stretching over 30-50 kilometers, don't get cleaned up. We explore this evolution of drone use in the conflict - where it came from, and why.