Extreme Engineering is a documentary television series that aired on the Discovery Channel and the Science Channel. The program featured futuristic and ongoing engineering projects. After ending of season 3 it airs under the Build It Bigger name. The series last season aired in July 2011. Danny Forster first hosted the series in season 4 and has been the host since season 6.

Baku is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and in the Caucasus region. Baku is 28 metres (92 ft) below sea level, which makes it the lowest lying national capital in the world and also the largest city in the world below sea level. Baku lies on the southern shore of the Absheron Peninsula, on the Bay of Baku. Baku's urban population was estimated at two million people as of 2009. Baku is the primate city of Azerbaijan—it is the sole metropolis in the country, and about 25% of all inhabitants of the country live in Baku's metropolitan area.