Underwater salvage video....on Go Pro
Occoquan River Salvage Exploration - YouTube
Check out this river I did some salvage in with my business. This video was done with a Go Pro. The water was 35 degrees and I couldn't see anything without the light but the video makes it look 10x better I could only see about 6 inches in front of me with the light. In the video you see a fuel or oil tank that I have been tasked with bringing it up, it appears to be at least 1000 gallons.
With my job sometimes I have to go into Hazmat like conditions but mostly it is just disgusting water but not classified as Hazmat.