When you hear the words deep sea mining, what comes to mind?

Probably not much—and that’s kind of the problem. For most of us, the deep ocean feels far away. Out of sight, out of mind. But right now, a handful of companies and governments are pushing to mine the ocean floor for metals—and scientists are raising red flags.

Here’s why this matters more than you might think.

First let’s start with what they’re mining. The target is something called polymetallic nodules—black potato-sized lumps that litter the seafloor at depths of 13,000 to 20,000 feet. These nodules are rich in cobalt, manganese, nickel, and other metals used in electric vehicle batteries and renewable energy tech. They’ve been sitting undisturbed on the ocean floor for millions of years.

Until now.

Companies want to send down massive remote-operated machines to scoop them up, along with the top layer of seafloor sediment. It’s being marketed as a cleaner alternative to land-based mining. But the deep sea isn’t a blank slate—it’s a living, breathing, still-mostly-unknown world.

Life down there is…wild. We’re talking about a part of the Earth we know less about than the surface of Mars. The creatures here are adapted to pitch blackness, crushing pressure, and freezing temperatures. Think ghost octopuses, bioluminescent jellyfish, and spindly coral that can live thousands of years. But here’s the catch: the very moment we start disturbing this environment, we risk wiping out life we haven’t even discovered yet. And here’s where it gets even more interesting.

The nodules themselves are creating oxygen.

In 2024, researchers made a mind-blowing discovery: microbes living in and around deep sea nodules were found to produce oxygen in the absence of light—what scientists are calling “dark oxygen.” Let that sink in.

These tiny organisms might be playing a role in Earth’s oxygen cycle that we never knew existed. And if we destroy their habitat? We might be interrupting a global process we barely understand. It’s a bit like demolishing an ancient forest and realizing afterward that the trees were filtering toxins out of the air. Too late.

What could go wrong? Plenty. Sediment plumes from mining can drift for miles, clogging filter feeders like sponges and anemones and disrupting marine life far beyond the mining site. Noise pollution travels much farther in water than in air, disorienting whales, dolphins, and deep-sea species that rely on echolocation or vibration. Carbon release from disturbing the seafloor could undo some of the climate benefits these metals are meant to support. And lastly, permanent damage to habitats that may take hundreds or even thousands of years to recover—if ever. All for a quick hit of rare metals. The worst part? We already know the result of deep sea mining. Tests were conducted 50 years ago, and they left lasting environmental damage. The scars haven’t even begun to heal.

So, what the status, globally? The International Seabed Authority (ISA), which governs the high seas, has been under pressure to start issuing mining licenses. Some countries—like Norway, China, and Nauru—are ready to go. But resistance is growing fast.

More than 25 countries (including France, Germany, and Chile) have called for a moratorium or ban on deep sea mining. Over 800 marine scientists and policy experts have signed open letters urging caution. Even major companies like Google, BMW, and Samsung have pledged not to use minerals from the deep sea. And the U.S.? As of June 25, the Department of the Interior announced plans to fast-track deep sea mining in U.S. waters, enacting a Trump-era executive order. This includes expediting permits, extending exploration timelines, and speeding up environmental reviews.

So what can we do? Here’s the good news: this hasn’t started yet. Not at full scale. We still have time to press pause.

It starts with awareness—because most people have no idea this is happening. The more we shine light on the deep ocean, the harder it becomes to destroy it in the dark. The deep ocean isn’t a junk drawer to mine through. It’s a living archive of life on Earth—one that may hold secrets to our future. Let’s not bulldoze it before we understand what we’re losing.

If you learned something new today, consider sharing this post. Awareness is the first defense. And if you can, please take action, and call your congressman to oppose deep sea mining.