the mekong sustains tens of millions of lives. for thousands of years, it has filled fishermen�*s nets and nourished rice fields right across south—east asia and china. but there are increasing signs that this ecosystem — one of the richest ecosystems on the planet — is being strangled. the mekong is under an onslaught of dam building, intensifying climate change and sand mining. but there is some hope. join us as we head downstream in cambodia and meet the communities having to adapt to the changing nature of this river... translation: there will be no fish for the next generation. . ..and those trying desperately to save it. translation: when i see this, it makes me worry about mekong's fate. mi lives in a world of water that was once predictable, reliable, renowned for an abundance of fish. but in recent years, he and thousands like him have been asking, "where are they?" this is the tonle sap, south—east asia's largest freshwater lake. fish caught by communities here feed millions across cambodia. translation: these past few y

the mekong sustains tens of millions of lives.east asia and china. but there are increasing signs that this ecosystem — one of the richest ecosystems on the planet — is being strangled. the mekong is under an onslaught of dam building, intensifying climate change and sand mining.

our pilots to ad lib after a couple of shots mekong they come in without the plane plane now thailand is our strongest ally in the southeast asia. it must be our embassy here has windows. in this country has never been conquered? no wonder nobody can get through that traffic. a native name thailand is hmong thai means land of the free. the who thought that up never tried to buy anything in bangkok. i want to tell you that. this is a rough spot on the program for me i can't figure out of the audience is applauding me or welcoming raquel welch on stage stage. you know that if you travel to the beat a different drum can tell by way that her on the every time you make eyes at me and oh oh you got and new money they all work out that any child i ever got to my down you can see the bird at the tree i don't get me wrong he's bad enough for me i'm not my boy who do to love only me and i ain't saying you and gritty, is it? i ready for any the place of thing to try to up the rain into me. yeah, it is by i believe it ain't. no smith green even though developed love that if you gonna live without

then over the mekong river into thailand. yeah, we had different -- every single thing had to be vetted in such a delicate fashion. in china, none of us were in china, obviously. that was only the underground railroad shooting and one family member of the family who we followed. we were able to be in southeast asia, but there were areas where someone could be but not someone else. this camera could be used, not that camera. it was -- >> how did they trust you as an american? the grandma says i was suspicious of these americans, but how did you work on it? >> for grandma, you could feel the sort of dialectic inside her. on one hand, every time she looked at me, she would kind of tear up. there was this kind of, she was grappling with what she has known to be true her whole life in north korea, which is that we are her enemy, and what she was experiencing in the moment, in the present. and it was this unfolding that was extraordinary. >> when we come back, we'll find out what happened to the row family. did they make it to free