Seasteading—the concept of creating permanent, autonomous human settlements on the open ocean—often seeks to escape traditional national jurisdiction. However, floating libertarians face a formidable legal barrier when attempting to anchor their structures above a coastal nation's continental shelf. Under the United Nations Convention on the Law of the Sea (UNCLOS), a coastal state's sovereign rights extend far beyond its 12-nautical-mile territorial sea.
Specifically, UNCLOS grants sovereign rights over the continental shelf for the purpose of exploring and exploiting its natural resources. Furthermore, Article 60 of UNCLOS explicitly gives coastal states the exclusive right to construct, authorize, and regulate artificial islands, installations, and structures on their Exclusive Economic Zone (EEZ) and continental shelf. This means that even if a seastead floats on high seas surface waters, anchoring it to the seabed or maintaining physical contact with the continental shelf subjects it directly to the host nation's regulatory authority.
Historic attempts to claim sovereignty on artificial platforms, such as the Republic of Rose Island off the coast of Italy in 1968, resulted in swift military demolition by national governments asserting control over their continental shelves. Modern ocean pioneers must navigate a complex legal web where seabed rights routinely override surface freedom.