North Korea has arrested four officials over the failed launch of a new 5,000-tonne destroyer that enraged the country's leader, Kim Jong Un
Experts say a technique used to maneuver the ship into the water sideways was part of the problem.
It was the first time analysts had observed North Korea using the sideways launch for warships and pointed to a lack of experience, as well as political pressure from Kim for quick results, for the mishap, the New York Times said.
