hands in black water

The video starts in darkness, with the noise of roaring water. We perceive a light and we slowly move towards that direction, in a small rowing-boat. We are investigating but our search is not easy, we in an underground canal. Water seems black, not only due to obscurity, and while getting near the exhit of the canal we can see dark oil in it. A barrier is closing the canal, so that oil cannot futher contaminate. We go back but all is dirty, also our hands.
The video is shooting a real intervention I made for stopping oil contamination in a small canal bordering on Serio river.