The primary specific aim of this RCT is to determine the effect of induced moderate HYPO (32-33 °C) after severe TBI in children on mortality at 3 months post injury. The primary outcome measure will be the GOS; the primary time point for evaluation is 3 months. Further secondary functional outcome measures will include the GOS - Extended Pediatrics (GOS - E Peds), and Vineland Adaptive Behavior Scale (VABS) and will be assessed in conjunction with the GOS at 6 and 12 months post injury.