Well, surely the staggering amount of torpedo and bomb hits she suffered didn't help her to mantain structural integrity as she went down. Although as far as I know there was no report from survivors of a massive explosion on the scale of that suffered by Yamato.
Anyway, for those who are interested, the entire stream has been recorded and there is a video of it on youtube:
skip to about 25:00 as there are just stillframes before that moment.
a screen of the wreck as seen from the Octopus monitors. Took from that very same video.