The stricken Russian mini-submarine trapped at the bottom of the Pacific has returned to the surface with all seven crew members alive. The sailors are undergoing medical checks but initial reports say they are all in satisfactory condition despite enduring freezing temperatures and dwindling air supplies. The AS-28 sub made an emergency surfacing and appeared off Russia’s far east coast at around four-thirty pm local time. It had been stuck 190 metres on the Pacific ocean floor for three days after getting its propeller tangled with the antenna of an underwater monitoring station.The vessel, named Priz, was eventually freed by an unmanned British Scorpion rescue robot. It cut the main cable keeping the mini-sub rooted to the seabed. The accident stirred up memories of the botched attempt to save a Russian nuclear sub five years ago. But this time, the Kremlin’s quicker appeal for international help has paid off.