4. Bölüm: 4. Bölüm

Bölüm Konusu

How does a dam resist the crush of millions of gallons of water? Host David Macaulay surveys the dam -- the biggest, costliest structure of all -- from Hoover's concrete arch confronting the Colorado River to the Aswan High Dam, a veritable underwater mountain sitting on the Nile riverbed, holding back a lake the size of England.