. They're on their way to collect wounded Ukrainian soldiers. Often, it's too late.

But they do save many lives.

Since the war started, Serge and Andre think they've recovered about 500 casualties between them.

. Camera can't give you the smell. Can you imagine the smell? This is a good smell. The smell of blood, the smell of the flood. What's the name? Tamado. Ifentanil.

I'm anesthesiologist, a doctor, and I deal with most traumas. I'm going to give him.

Grenades dropped from drones have become a key weapon in this war.

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Most of the team's work is done at night when the risk from Russian artillery and drones is lower.

But sometimes they have to risk the day. They're meeting casualties at an evacuation point. Ukraine doesn't release the exact numbers of being killed or wounded, but this war has taken a terrible toll.

. We have some boys who say, It's better to die than to be an invalid. No, boys. No, it's not how it works. It's better to stay without your hands, without your legs, but your son's father was not a father. Your wife's husband was a father. Your mom was a son. That's how it works.

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This man has a tourniquet applied to his leg to stop the bleeding. They restrict blood to the limbs and have transformed battlefield medicine, saving countless lives.

But it's not just those fighting on the front lines who are paying a heavy price.

Back at the night time evacuation, and they make it to the field hospital..

He's rushed into surgery where they try and save his badly damaged leg.

. He lost his leg. No one knows exactly how many, but certainly tens of thousands of Ukrainians have lost limbs because of this war.. Were it not for the country's medics, they could have lost their lives as well.. I want to go home. I want to go to my wife. My wife is pregnant. I want to see how grow my children, and to educate them, and to raise them. They are better people than me..