This guy has got some good dive video's up on you tube. Probably some of the best underwater video's that I've come across. Here's one on lake Malawi
Just search YouTube. But, I don't think you'll find many full length docurmentaries, unfortunately. Wish there were. Nat Geo did 'Jewel of the Rift' a while back on Lake Tanganyika. Here it is on Amazon.
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