Oh my. That sheet of whatever it is must have buoys on the other end so that they are contained in a safe area? It really looks so sci fi. Like they just shot out of an alien placenta. Yuck. What an unusual photo!
I was thinking the same thing- what a strange shot - the lighting made it look to me like a studio interior pool shot!
I think that in the film Master and Commander there was a scene like this. Captain Aubrey (Russell Crowe) had his ship, the Surprise, stuck stuck stuck in the doldrums just before rounding the Horn and it was hot hot hot. They threw one of the canvas sails out into the water still connected to the bow so the crew could swim in it.