From the Colossus of Rhodes and Egypt's pyramids to the Hoover Dam and the Space Shuttle, mankind has celebrated the work of engineers. But what happens when their calculations prove wrong? From Hammurabi, who passed the first building laws, to today's potential disasters that can wipe out a whole city, we review engineering mistakes.

Join us for look into five engineering disasters... A dangerous cloud of gas explodes into Cleveland's worst fiery industrial disaster in 1944, killing 128 people. A dance competition turns deadly at the new Kansas City Hyatt in 1981, when a skywalk gives way and kills 114. In 1995, neighbors gaped at the spectacle of a $1.5-million San Francisco Bay area mansion breaking into bits as it fell into a massive sinkhole during a rainstorm. In 1931, one of the worst "natural" disasters ever occurred in the Yangtze River basin when six huge flood waves swept down the river destroying the insufficient dams and levees and killing at least 145,000 people. the "miracle mineral" that the US was built upon turns out to be an invisible killer--an estimated 10,000 people die each year from asbestos-related diseases.

In Milwaukee, 104 died after drinking contaminated tap water. At Texas A&M, a tradition turned tragic when a pile of bonfire logs collapsed onto its builders. Thousands of US soldiers expired in known WWII deathtraps--Sherman Tanks. In 1973, 14 men working on a 26-story building died when supports were removed from wet concrete. And in 1993, Denver's "dream" airport became a nightmare when its baggage-handling system ran amok. Aided by computer graphics, catastrophe footage, and visits to the locations today, MIT scientists, Center for Disease Control experts, WWII vets, bonfire builders, and construction engineers explain these tragedies and measures taken to prevent them in future.

In this hour, death seeps out of the ground into a neighborhood sitting on a toxic waste dump at Love Canal in New York; soldiers die during Desert Storm in 1991 when software flaws render Patriot Missiles inaccurate; on September 11, 2001, World Trade Center Building #7 wasn't attacked, but seven hours after the Twin Towers collapsed, it too is mysteriously reduced to a pile of rubble; a night of revelry in Boston turns the Cocoanut Grove nightclub into an inferno that kills over 400 people in 1942; and the science of demolition is put to the test and fails when a building in Rhode Island, the "Leaning Tower of Providence," stands its ground.

In this hour, we examine a massive oil tanker explosion that killed nine; a subway tunnel cave-in that swallowed part of Hollywood Boulevard; a freighter plane crash that destroyed an 11-story apartment building; an historic molasses flash flood; and a freeway ramp collapse that buried construction workers in rubble and concrete. Investigators from NTSB, Cal/OSHA, and Boeing, structural and geo-technical engineers, and historians explain how so much could have gone wrong, costing so many lives. And aided by computer graphics, footage and photos of the disasters, and visits to the locations today, we show viewers what caused these catastrophes and what design experts have done to make sure they never happen again.

A series of construction errors causes a devastating flood that brings Chicago to a standstill. A deadly accident traps hundreds in a smoke-filled Alpine tunnel, with no ventilation. Three boilers explode on a Mississippi riverboat resulting in thousands of deaths and earning the disaster the title of the worst in maritime history. Two buildings, halfway around the world from each other, collapse from the same type of shoddy construction methods--14 years apart. And a cockpit warning system malfunctions, causing a fiery, fatal crash before the jetliner ever takes off. We interview design and construction experts as we investigate what went wrong. And we talk with rescue personnel, eyewitnesses, and victims as we visit the tragedies' sites to see what improvements have been implemented to insure against these kinds of disasters.

Chaos in Guadalajara, Mexico, when the city streets explode; an airplane crash outside of Paris that ranks as one of the worst in history; two mining dams in Italy collapse engulfing a village in a tidal wave of sludge; a generation of children in a small Texas town are entombed in the rubble of their school; an oil tanker runs aground off the coast of England and introduces the world to the devastation of the first super spill... Engineering Disasters 16 delves into the shocking chain of events leading up to each of these horrific catastrophes and examines resulting technological improvements designed to prevent similar tragedies in the future.