During a 'health check' of London's Thames River, experts found sharks, eels, seals, and seahorses in the river which was once declared 'biologically dead'. The river had been declared 'biologically dead' in 1957, meaning it was believed that the water body could not sustain any wildlife and life forms.

United Kingdom: Once biologically dead, Thames now nurses sharks

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United Kingdom: Once biologically dead, Thames now nurses sharks