Hidden beneath the Kalahari Desert is a 264-metre-deep underground lake where blind animals thrive in darkness

Sixty metres beneath one of southern Africa's driest landscapes lies a world that seems strangely detached from everything above it. The surface of the Kalahari Desert is defined by heat, sparse vegetation and long stretches of rocky ground, yet hidden underneath part of this vast region is a body of water so large that it took decades to understand its true scale.

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