Our seas and oceans have long been central to human civilization, while at the same time we built dikes and islands to reclaim land. As technology improves, we may see even more ambitious efforts in the future. In the episode we will explore the options, both for ways we may extend our civilization to the sea and the motives of doing so. We will also look at seasteads and seasteading, artificial islands built in international waters with the intent of being new, sovereign nations.