Definitely curious about the jurisdiction aspects here. There aren't any immediate cases that come to mind re stuff outside EEZs (I wonder if there's any precedent associated with oil rigs - they're the only freestanding marine structures that immediately come to mind, besides artificial islands).

One thing that does stand out is the sheer greyness of it all - international legal matters like this move very slowly and moreover the ICJ seems very poorly equipped to answer questions like this.