The Submarine Ecosystems That Exist Nowhere Else on Earth — and Where Mining Wants to Go

Hydrothermal vents are among the most extraordinary environments on Earth. First discovered in 1977 near the Galápagos Islands, they are submarine springs where seawater percolates through cracks in the ocean crust, is superheated by magma, and erupts back into the water column laden with dissolved metals and chemicals. What makes them remarkable is not the geology — it is the life.

Chemosynthetic Ecosystems

Unlike virtually every other ecosystem on Earth, hydrothermal vent communities are not powered by sunlight. They run on chemosynthesis: bacteria and archaea oxidise hydrogen sulphide and methane to produce energy, forming the base of a food web that supports tube worms up to two metres long, ghostly shrimp with no functional eyes, dense colonies of mussels and clams, and predatory fish and crabs that exist nowhere else on the planet.

The species at vent fields are often endemic — found at that specific location and nowhere else. When a vent is destroyed, those species are gone. There is no recolonisation pathway, no refugium, no genetic reservoir elsewhere. This is extinction in the most final sense.

The InterRidge Global Database of Active Submarine Hydrothermal Vent Fields catalogues 721 vent fields worldwide. Abyssal Claims cross-references every ISA mining concession against this database, revealing where exploration contracts directly overlap with known vent locations.

Why Vents Are Targeted

Hydrothermal vents build polymetallic sulphide deposits — chimneys and mounds of copper, zinc, gold, and silver precipitated from vent fluids over thousands of years. These deposits are found along mid-ocean ridges and back-arc basins and represent a commercially attractive ore source, particularly for copper and precious metals.

The conflict is direct and unavoidable: mining a sulphide deposit means destroying the vent system that created it.

The Scale of Overlap

Abyssal Claims spatial analysis finds that a significant fraction of ISA exploration contracts for polymetallic sulphides overlap with known active or recently active vent fields. The precise figure varies depending on the buffer distance applied and whether extinct (no longer venting) systems are included, but even conservative analyses show dozens of conflicts between concession boundaries and vent locations documented in peer-reviewed databases.

What Science Says

The scientific consensus on vent ecosystem recovery is stark: recovery from physical disturbance takes decades to centuries, if it occurs at all. A 2020 review in Annual Review of Marine Science found that the fauna characteristic of mature vent ecosystems — the large tube worms, dense bivalve beds, and endemic invertebrates — recover extremely slowly even after natural disturbance events like lava flows, and that mining-scale sediment plumes pose additional threats to communities tens to hundreds of kilometres from the extraction site.

The International Union for Conservation of Nature (IUCN) has classified 33 hydrothermal vent species as threatened on its Red List, with deep-sea mining specifically identified as the primary threat driver.

What Can Be Done?

Researchers have proposed several measures:

Preservation reference zones — areas of identical habitat left unmined to allow scientific comparison and potential recolonisation. ISA regulations require these, but their size and placement remain contested.

Pre-mining surveys — comprehensive biodiversity assessment before any extraction, identifying endemic species and population densities. Currently required but subject to methodological disputes.

Mining moratoria — several states and the Deep Sea Conservation Coalition have called for a halt to exploitation contracts until the science of impact prediction matures. France, Germany, Chile, and the UK have indicated support for a precautionary pause.

Follow the Conflicts

Abyssal Claims shows the spatial intersection of every ISA concession with the InterRidge vent database. Click any concession on the map to see how many vent fields lie within its boundaries and review the biodiversity observations recorded by OBIS in the surrounding area. The data is updated weekly.