The International Seabed Authority (ISA), a UN body that manages mineral-related activities in the deep sea, cannot lawfully approve deep seabed mining without first adopting benefit-sharing rules, a core treaty obligation that remains unresolved despite mounting pressure to launch commercial extraction, legal experts say.Debate over deep seabed mining has largely focused on when the ISA, a UN-established body overseeing mineral activities beyond national jurisdiction, will finalize long-negotiated exploit ...