been shut down. thanks for joining us. ac 360 begins now. good evening. we begin tonight with a 360 exclusive, inside the fighting in ukraine from a perspective that s never been shown before. the view from inside a ukrainian combat helicopter flying at treetop level and sometimes below the tree line, under constant threat from ground fire and fighters above. flying these choppers is one of the most dangerous jobs in this war, and with russia beginning a new offensive, it could soon get even riskier. cnn s sam kiley has the story. reporter: the target is russian troops. a hard bank left and a dive, and flares to distract heat seeker missiles. a pair of ukrainian helicopters on an assault against russian forces close to backwards. there are russian aircraft waiting on the border. we should be careful when we go. we should fly very low. to prevent our recognition. reporter: below, trenches, and east ukrainian villages smashed by war. back from this sortie, this forward
things over, but nothing major. so all the work you need to do can still be done. absolutely. reporter: over just 36 hours they put up all these tent flaps, set up jimmy nader s, even brought their own water purifiers. we use this machine here, it s a reverse osmosis machine. it will allow us to get it from anywhere including the ocean and do desalination if we want to. and you just keep it in these bladders. these look full, so this is a constant process. reporter: all of this so they are able to give the best care to their patients, like when-year-old mammoth. his mother glued to his side, telling us her story through a translator. what was happening to him ? he couldn t breathe anymore, not properly. reporter: she thought he had the flu the past few days, but things got worse this morning, maybe from the fumes. as many people have been doing, they were burning plastic to