Two Russian mini-subs have made a test dive to the floor of the Arctic Ocean near Russia's most northerly islands.The subs reached a depth of 1.3km (0.8 miles) at a point 87km north of the Franz Josef Land archipelago.
The dives were a trial run ahead of a planned descent later this week to leave the Russian flag on the seabed 4km below the North Pole.
The team is looking for geological evidence to support Moscow's claim to the resource-rich Arctic seabed.
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