Several thousand meters beneath the surface of the Pacific Ocean, far beyond where light reaches, the seafloor is covered in clusters of dark, misshapen rocks. They look unremarkable. They are anything but. These polymetallic nodules — encrusted with cobalt, nickel, manganese, and other metals that power electric vehicles, defense systems, and AI infrastructure — are quietly becoming one of the most contested resources on Earth.
And right now, the United States and China are both circling the same stretch of ocean, racing to get there first.
The Cook Islands, a small Pacific nation positioned roughly halfway between Hawaii and New Zealand, has found itself at the center of this contest. Its ocean territory is vast, its seabed is mineral-rich, and its government is carefully weighing what development might mean for a country that depends heavily on its ocean for identity and livelihood. Earlier this year, both Washington and Beijing signed separate cooperation agreements with the Cook Islands related to seabed mineral research. The timing was not coincidental.
There’s a sense, watching this unfold, that the deep sea is becoming the next front in a much older rivalry. China already holds more deep-sea exploration licences in international waters than any other country. The United States, under a Trump executive order signed in April, is now pushing to accelerate seabed mineral development — including in waters governed by international conventions that Washington has never actually signed. That detail matters more than it might seem. It suggests a willingness to operate outside the rules-based frameworks that the US has historically championed, raising questions about what kind of precedent that sets when weaker nations are watching closely.
Land-based reserves of cobalt and nickel are shrinking, and much of what remains is controlled or processed by China. That reality is pushing governments and mining companies toward the deep sea not just out of ambition, but something closer to anxiety. The clean energy transition — solar panels, wind turbines, EV batteries — requires enormous quantities of the same metals sitting on the Pacific floor. It’s a genuinely complicated position: the pursuit of green technology may hinge on one of the most environmentally disruptive extraction methods ever proposed.
Scientists have been sounding alarms for years. Douglas McCauley, an ocean science professor at UC Santa Barbara, describes the ecosystems targeted for mining as among the least resilient on the planet. Sediment plumes from extraction machinery, light disruption, noise and vibration — these are not hypothetical concerns. They are expected outcomes. Some researchers believe the damage would be large-scale and, critically, irreversible. The deep sea recovers slowly, if at all.
Still, for nations like the Cook Islands, the picture is more complicated than a simple conservation argument. Some residents see mineral development as a pathway to economic independence. Others worry about what happens to fishing communities, cultural identity, and ocean health if something goes wrong five kilometers below the surface. The Cook Islands’ Seabed Minerals Authority has stressed that the country is currently engaged only in scientific research and has made no commitment to commercial extraction.
It’s still unclear whether any of the major players — governments, mining companies, or international regulators — are truly prepared for what commercial deep-sea mining would mean at scale. The International Seabed Authority, which governs mineral rights in international waters, has been trying to finalize a mining code for years. Progress has been slow and contested. Thirty-eight countries have called for a moratorium.
What is clear is that the race is accelerating. And once you start pulling rocks off a seafloor that took millions of years to form, there’s no putting them back.
