In the 1970s, the US dumped up to 2 million tyres off Florida's coast to help marine life. More than 50 years later, the cleanup is still underway

For a time, placing old vehicle tyres on the seabed was seen as a practical way to create habitat where marine life might gather. Similar projects appeared in different parts of the world during the second half of the twentieth century, reflecting ideas about artificial reefs that were widely accepted at the time.

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