Ocean colonization, also known as marine colonization, is the act of building structures or settlements in the ocean. Alternative phrases include ocean settlement, underwater communities, aquatic colonization and oceanic homesteading. The idea of humans establishing a permanent presence in the ocean has been around for centuries, but it has gained traction in recent years due to technological advancements. Some advocates see it as a way to address overpopulation on land and explore the vast potential of the sea. While the concept still faces many challenges, such as safety concerns and environmental impact, the range of synonyms for ocean colonization highlights its potential significance for human society.