Russian explorers have planted their country's flag on the seabed 4,200m (14,000ft) below the North Pole to further Moscow's claims to the Arctic.They were travelling aboard two mini-submarines on what is believed to be the first expedition of its kind.
Having planted the rust-proof titanium metal flag, the explorers will collect scientific samples and begin the risky journey back to the surface.
Melting polar ice has led to competing claims over access to Arctic resources.
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