A deadly tragedy on a freeway in Oklahoma sends one of the state's busiest bridges collapsing into the Arkansas river below; expert engineers investigate how a tugboat striking a reinforced concrete pier could cause such a catastrophic disaster.

A shipping catastrophe occurs when a massive container vessel, the Ever Given, runs aground and completely blocks the Suez Canal, one of the most vital trade routes on the planet; experts investigate and uncover critical wind conditions and potential navigational errors.