ABSTRACT While electrochemical direct ocean capture (e‐DOC) offers a plausible pathway for gigaton‐scale decarbonization, its practical deployment remains bottlenecked by complex reactor architectures, constrained fluid‐electrode interfacial areas, massive Ohmic penalties, and severe mineral fouling. Herein, a compact, membrane‐integrated hollow fiber electrode assembly architecture that systematically overcomes these limitations for continuous marine carbon mineralization is reported. Macroporo