LankyLurker

I actually think some of the better documentaries do raise interesting questions, even if they're not conclusive.

The audio recorder thing is brilliant data. Did you back up the file? That rumbling frequency could be subsonic vocalisation. A lot of big primates produce sounds below human hearing range.

I'm hesitant to post this because it sounds completely unhinged, but I genuinely need to talk to someone who might understand.