I was hovering at approximately 1000 feet above Lake Berryessa, then I descended into the Glory Hole and almost lost my drone. When I lowered the drone into the Glory Hole it became unstable and almost crashed into the side of the Glory Hole. (3:08) My guess is all the water draining into the spillway created a sort of vacuum that made the drone unstable the further into it I flew. "For licensing/usage, please contact licensing@rumble.com" .