The C-130 was built to haul large amounts of cargo and carry very heavy weights. They're often used as airtankers and can be retrofitted to carry up to 16 tons of fire retardant. When a C-130 crashes while fighting a wildfire in Australia, investigators face many challenges in determining the cause of the crash— like conducting the investigation within an active fire zone. Watch the new season of Air Crash Investigation on Mondays at 9pm, on National Geographic UK. | National Geographic UK