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"Spider Megacity" Found Inside Sulfur Cave

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István Urák led an expedition to study the spider web in detail (Credit: Urak et al. 2025/ CC-BY-4.0/ Subterranean Biology)

Researchers have found the largest spider web ever recorded inside a sulfur-rich cave along the Greece–Albania border. The "spider megacity" covers an astounding 1,140 sq ft (105 sq m). This is about the size of a small apartment. This remarkable discovery was revealed by biologist István Urák and his team on October 17, 2025.