When he shows the first signs of losing hope , he must rely on a hallucination of Lt. Col. Samantha Carter for his survival .
Eventually the pressure is too great for the windows and Griffin sacrifices himself to seal McKay into the rear compartment .
When McKay shows the first signs of losing hope , McKay must rely on a hallucination of Lt. Col. Samantha Carter for McKay 's survival .
Eventually the pressure is too great for the windows and Griffin sacrifices himself to seal McKay into the rear compartment .