Pushed to the Limit

S4, E4: It's a clear and calm December day in 1997 when a Boeing 737 suddenly plummets from the sky, slamming into the Indonesia jungles at supersonic speed. All 104 aboard are killed on impact, their bodies lost in the muddy Musi River. Evidence points to a serious mechanical failure, but when the full story of SilkAir Flight 185 is finally revealed, the cause is far more troubling than anyone could have imagined.