“As the earth’s population steadily increases, so does the pressure to open new frontiers. While the oceans have long been used for transportation, this book is an extended thought experiment about how they could support permanent settlements. Considering these issues will be invaluable no matter which way humanity next expands. In particular, the ocean bears some definite similarities to space: the final frontier, which will surely be an important part of our near future.”
Intro page / Book / Contest / Wired article. Related: the Venus Project.