RedactedNarrative: Operator 1 turned the engine off to fish a riffle. Operator 1 realized the current was faster than he expected. Operator 1 attempted to restart vessel 1 and it failed to start. Vessel 1 drifted downstream into a tree sticking out from the river bank. This caused the left side of vessel 1 to swamp and fill with water. Vessel broke loose from the tree, went downstream more and came to rest submerged against a tree.