Living below the sea is possible, at least for a short time. So what is stopping us creating colonies to ease over-population, or guard against disasters?
Ian Koblick hoped the colourful seaweed samples he brought into class would impress. His marine biology professor at Stanford University commented on their beauty and asked where he had found them. Ian replied that he had collected them while exploring off the Californian coast using the Aqua-Lung, an early version of today's scuba equipment. His tutor dismissed his innovative approach. "Diving is for daredevils," she reprimanded. “If you want to be a real scientist, collect like a scientist.”
The year was 1962, and it did not take long for her words to seem antiquated. Jacques-Yves Cousteau's exploration of shipwrecks, discovery of previously unknown marine flora and fauna, and invention of novel deep-sea exploration tools had already captured public imagination worldwide. A wave of interest in undersea exploration was washing over the scientific community. There was serious talk of creating colonies on the bottom of the sea.
For the rest of the story: http://www.bbc.com/future/story/20130930-can-we-build-underwater-cities