Nat Geo+1

Mining has been a very dangerous process. Now, with the evolution of engineering, colossal machines have made the unthinkable possible. (4 of 6) 7+.

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In 1943, two Allied convoys carrying vital supplies for the war effort set out for Britain. What followed was the largest convoy battle of the Second World War. 7+.

Experts discover a deadly oversight when a packed commuter flight slams into a hangar. Plus, a cargo plane crashes in Miami in a totally avoidable accident. (S2, ep 6) 7+.

Buried Secrets of the Gold Rush: The team drain San Francisco's streets, the Sacramento river and Klondike's icy waste to tell the true story of 19th-century gold mania. 7+.

Secrets of the Ark of the Covenant: Uncover what archaeology reveals about Exodus, Canaan and the Ark as ancient ruins challenge the biblical story. (3 of 6) 7+.

Tunnels are engineering marvels, cutting through the landscape and creating direct routes - until they cave in. Plus, a bridge suddenly collapses in Miami. (S1, ep 5) 7+.

Tim and Fuzz find an Escort RS that has seen better days, and meet the owner who needs a helping hand restoring it. (S2, ep 9) 7+.

An out-of-control turboprop breaks apart while trying to land at Düsseldorf airport, instantly killing everyone on board. (S25, ep 3) 7+.

One of the greatest fortifications in warfare history, the campaign to breach Hitler's Siegfried Line cost 140,000 American casualties. (S2, ep 2) 7+.

In 1982, a flight from the US capital crashed into a bridge on the River Potomac. All but five of the passengers perished under the water. What went wrong? 7+.

The guys try to cheer up Gary, who's had a spell of ill health. But they soon find that not a single part of his Ford Escort is salvageable. (S7, ep 9) 7+.

At Rome's Fiumicino Airport, Border Police stop a father and son traveling with fake passports, and a woman refuses to cooperate.

Experts investigate the shocking crash of United Airlines Flight 173. Ten people died in the disaster in Oregon. What caused all four of its engines to fail? 7+.

Brace for disaster as highways fall, bridges collapse and buildings crumble in a global tour of shocking engineering failures. (S3, ep 2) 7+.

Witness the aftermath as crews battle radioactive fallout, a concrete tomb seals the reactor and the world questions the Soviet story. (3 of 4) 7+.

Uncover the truth as trials unfold, hidden reactor dangers emerge and decades later Chernobyl's exclusion zone becomes a war zone. (4 of 4) 7+.