A Russian mission to explore the ocean floor below the North Pole is back on track after engineers fixed an engine problem aboard one of the vessels.
The Akademik Fyodorov research ship had suffered engine failure a day after setting off from Murmansk port.
A nuclear-powered icebreaker turned back to help, but reports say the engine was fixed before it arrived.
Russia plans to send a mini-submarine 4,200m (14,000 ft) down to help back a claim to the energy-rich Arctic seabed.
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