Where are North Korea's submarines? Whereabouts of 50 vessels which vanished from radar is still a mystery days after Kim Jong Un ends stand-off with the South

Where are North Korea's submarines? Whereabouts of 50 vessels which vanished from radar is still a mystery days after Kim Jong Un ends stand-off with the South Around 50 vessels, which account for 70 per cent of Pyongyang's fleet, disappeared off radar last week, sparking fears they were readying for an attack.