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…sand ;)… crated by trusterpower… i have video somwhere i make cool vortexes 
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Good guess Christian…but no.
5 point clue. This is not sand but there might be silica involved.
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Spring algae bloom under ice?
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Bo, you got it. A small humic forest lake with some alga photosynthesizising under 60 cm of ice. Not sure if the alga was a diatom (silica based) or some dinoflagellate. It was great, like northern lights.
[Edit] the stuff could also be some species of chrysophyte ( Chrysophyceae).[/EDIT]
Thats me controlling the ROV with a shade.
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aa ok…cool …like you shade (can see the crowd watching, “what is he doooing?;D”