RedactedNarrative: Vessel 1 Operator towing four juveniles on a tube on the waters of Lake Redstone.  The Operator was turning left at speeds of approximately 25 mph.  While turning left, the tubers hit the wake from other boats and flipped the tube.  When flipping, two occupants, both wearing PFDs, of the tube struck heads and the Injured person was knocked unconscious.  The Injured person’s injuries consisted of a fractured orbital bone and severe head concussion.