This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Late last year, scientists in Germany published findings on a World War II munitions dump in the Baltic Sea. Some may dismiss the dump as hazardous waste, but to marine biologists it was something far more exciting: a thriving ecosystem.
Over the decades, the dump has become home to mussels, crustaceans, fish and marine plant life, creating a full community under the sea. It's an example of an accidental reef, highlighting nature's ability to reclaim even dangerous human detritus. Around the U.K. coast, there are thousands of famous wrecks.
I have had the pleasure of diving on many of them, witnessing firsthand how sea creatures turn rusting hulls into habitat. Further afield, deliberate artificial reef projects, from Australia to the Caribbean, are evidence that where structures sink, life follows. But let's not romanticize our wrecks.
While these structures offer a foothold for life, they can also leak toxic compounds into the oceans. Not all reefs are born from disaster. Around the world, governments, scientists and conservation groups have deliberately sunk ships, concrete structures and even old subway cars to create new marine habitats.
These artificial reefs are designed to mimic the ecological functions of natural reefs, boosting biodiversity and providing refuges for overfished species. They also draw scuba divers and recreational fishers, providing economic incentives for people who live nearby. In the U.S., the decommissioned aircraft carrier the USS Oriskany was sunk to create a tourist attraction off the Florida coast: the "Great Carrier Reef." In November 2026, an even bigger ship will be sunk nearby: the SS United States, an ocean liner larger than the Titanic.
In Japan, concrete blocks have been used extensively to stabilize coastlines and provide habitat for fish. In Australia, the "rigs-to-reefs" initiative means old oil rigs—too costly to remove—are being left in place to create new ecosystems. But there's a fine line between "marine habitat creation" and simply "dumping unwanted stuff." Poorly planned projects have often done more harm than good.
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