After a high-speed collision of three trains during rush hour in London causes dozens of deaths, experts use the latest tech to investigate what caused this catastrophic crash; what they find could hold the secrets of preventing future disasters.

When an eight-story factory suddenly collapses, over 1,000 people die in one of the deadliest engineering disasters in modern history; experts use cutting-edge tech to reveal what went wrong and what's being done to prevent the next catastrophe.