🚧 Megaprojects: Tunnels, Dams & Canals

What you’ll learn

1. The French Failure at PanamaUnderstand why the French Panama effort collapsed and how the Americans later succeeded.De Lesseps's lockless sea-level design was defeated by mudslides and a wild river. Yellow fever and malaria killed thousands because no one yet understood mosquitoes. A financial scandal ended the French effort in 1889. The Americans took over in 1904, controlled disease, and switched to a lock-and-lake canal that opened in 1914.
2. Panama's Locks and LakesExplain how the lock-and-lake system works and why water now limits the canal.Locks raise ships 26 meters to man-made Gatun Lake and lower them on the far side, with gravity doing the work. A 2016 expansion added larger locks for Neopanamax ships. Recent droughts have lowered lake levels, forcing limits on daily transits.
3. Suez: Joining Two SeasUnderstand Suez's lockless design, human cost, and strategic importance.Opened in 1869, Suez crosses flat desert at sea level, needing no locks, and was dug largely by forced Egyptian labor at heavy human cost. It carries roughly 12 percent of world trade. The 2021 Ever Given grounding blocked it for six days, halting billions in daily trade.
4. Hoover Dam: Taming the ColoradoLearn how Hoover Dam was built and the ice-cooling trick behind its concrete.Built 1931-1936, Hoover is a 221-meter arch-gravity dam creating Lake Mead. It holds about 2.6 million cubic meters of concrete, poured in interlocking columns cooled by chilled water in embedded pipes. It finished early; official records list 96 construction deaths.
5. The Channel TunnelUnderstand the Channel Tunnel's design and how tunnel boring machines dig underwater.Bored 1988-1994, the Channel Tunnel is about 50 km long with the world's longest undersea section, comprising two rail tunnels and a service tunnel. Eleven TBMs dug from both coasts, meeting within centimeters. The project ran roughly 80 percent over budget and cost ten lives.
6. The Gotthard Base TunnelLearn what makes Gotthard the world's longest and deepest rail tunnel.Opened in 2016, the Gotthard Base Tunnel runs 57 km through the Alps at up to 2.3 km depth. It lets trains cross at near-sea-level grade, excavated over 28 million tons of rock, and cost nine lives. Trains now pass through in about 17 minutes.
7. Three Gorges: Power and Its PriceWeigh the benefits and documented costs of the Three Gorges Dam.Completed in 2012, Three Gorges is the world's largest hydroelectric station at 22,500 MW, built for power, flood control, and navigation. Its reservoir displaced roughly 1.3 million people and raised concerns over landslides, pollution, and species loss. It is a case study in megaproject trade-offs.
8. How Megaprojects Go WrongUnderstand why megaprojects overrun and what is being built next.Bent Flyvbjerg's 'iron law' captures how megaprojects run over budget, over time, and under benefits, driven by optimism bias and strategic misrepresentation. The Big Dig and Sydney Opera House are classic cases. Today's giants include the Fehmarn Belt and Brenner Base tunnels and contested projects like NEOM.

Questions this course answers

Grounded in trusted sources

• American Society of Civil Engineers
• U.S. Bureau of Reclamation
• Encyclopaedia Britannica
• Oxford Saïd Business School (Bent Flyvbjerg megaproject research)

Every Wunder lesson is built from real, reputable sources — never invented.

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