Mystery Balloons Near Kim Jong Un’s Capsized Warship Puzzle Experts

SEOUL—North Korea confirmed Friday its capsized warship was upright and stable, but a layer of intrigue lingers around the salvage work: Why the armada of massive balloons?

Satellite imagery shows dozens of balloons floating around the 5,000-ton destroyer that toppled into the water at a May 21 launch event attended by the country’s leader, Kim Jong Un .