A specialist demolition team attempt to create the largest artificial reef in the world by sinking the aircraft carrier USS Oriskany. As they battle through thick steel plating and hazardous waste, the workers are aided by marine architects, divers, engineering units and local authorities.

\'National Geographic Channel MegaStructures\' takes a look at the construction history of Boston Big Dig project. Costing almost 15 billion dollars and taking almost 20 yrs to complete, the Boston\'s Big Dig is considered to be the most complex, expensive, and technically challenging civil engineering public works project in the United States. The project was inspired by Fred Salvucci, the Transportation Commissioner to the Mayor of Boston, who wanted to find a solution to the city’s traffic woes. He came up with an idea to link up the major sectors of the city with a system of wide underground tunnels for traffic. Consisting of 4 elements, a tunnel under the harbor, an underground connection to the Interstate 90, an underground traffic system under the city itself to replace the elevated city highway, and a wide cable-stayed bridge to replace the old double-decked bridge. The episode looks at the many obstacles that were faced in the construction, from water leaks to residential protest. The episode also contains brief words from some of the major people involved in the project.

The worst of the worst were sent here—men like Al \"Scarface\" Capone, Alvin \"Creepy\" Karpis, \"The Birdman\" Robert Stroud. For 29 years, Alcatraz was a ferocious battle between America\'s toughest prison and the brilliant criminal minds locked inside. We\'ll explore the design, construction and legendary escapes from The Rock.

A specialist demolition team attempt to create the largest artificial reef in the world by sinking the aircraft carrier USS Oriskany. As they battle through thick steel plating and hazardous waste, the workers are aided by marine architects, divers, engineering units and local authorities.

Aloha Airlines Flight 243 was a scheduled Aloha Airlines Boeing 737-200 flight between Hilo and Honolulu in Hawaii. On April 28, 1988, the aircraft suffered extensive damage after an explosive decompression in flight, but was able to land safely at Kahului Airport on Maui. One crew member was blown out of the airplane and another 65 passengers and crew were injured. The extent of the damage was only just below that which would have caused the airliner to break up, and the survival of the aircraft with such a major loss of integrity was unprecedented and remains unsurpassed.

When an aircraft\'s engines fail during its approach to Heathrow, the captain\'s quick thinking enables the flight to avoid nearby buildings. The craft crashes just short of the runway and all aboard miraculously survive. But what caused the engine failure in the first place - could Sherlock Holmes theories lend a hand to investigators? AKA: Heathrow Crash Landing

Aloha Airlines Flight 243 was a scheduled Aloha Airlines Boeing 737-200 flight between Hilo and Honolulu in Hawaii. On April 28, 1988, the aircraft suffered extensive damage after an explosive decompression in flight, but was able to land safely at Kahului Airport on Maui. One crew member was blown out of the airplane and another 65 passengers and crew were injured. The extent of the damage was only just below that which would have caused the airliner to break up, and the survival of the aircraft with such a major loss of integrity was unprecedented and remains unsurpassed.

When an aircraft\'s engines fail during its approach to Heathrow, the captain\'s quick thinking enables the flight to avoid nearby buildings. The craft crashes just short of the runway and all aboard miraculously survive. But what caused the engine failure in the first place - could Sherlock Holmes theories lend a hand to investigators? AKA: Heathrow Crash Landing