I can’t tell what it is, too dark. It could be seepage or is it the ROV’s stirring up the bottom?
I’m not sure either but it’s rising straight up and not outward like prop wake from the ROV would. Also, it rises on occasion from some distance away from the ROV and it’s intermittent.
As soon as others saw this and took screen shots and posted them on the internet, notice they shut down those 2 camera. They make me sick.