North Korea's second naval destroyer was damaged in its failed launch to the water this week, state media reported Thursday, in an embarrassment for leader Kim Jong Un as he pushes to modernise his naval forces.

It's not common for North Korea to acknowledge military-related setbacks, but observers say the disclosure of the failed ship launch suggests that Kim is serious about his naval advancement program and confident of ultimately achieving its objectives, reports AP.

During a launching event at the northeastern port of Chongjin on Wednesday, the newly built 5,000-ton-class destroyer became unbalanced and was punctured in its bottom sections after a transport cradle on the stern section slid off first and became stuck, according to the Korean Central News Agency.

KCNA didn't provide details on what caused the problem, the severity of the damage or whether anyone was injured.

According to KCNA, Kim, who was present at the ceremony, blamed military officials, scientists and shipyard operators for a “serious accident and criminal act caused by absolute carelessness, irresponsibility and unscientific empiricism." Kim called for a ruling Workers’ Party meeting slated for late June to address their “irresponsible errors."

“It's a shameful thing. But the reason why North Korea disclosed the incident is it wants to show it's speeding up the modernization of its navy forces and expresses its confidence that it can eventually build" a greater navy, said Moon Keun-sik, a navy expert who teaches at Seoul’s Hanyang University.

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Moon suspected the incident likely happened because North Korean workers aren't yet familiar with such a large warship and were rushed to put it in the water.

The damaged vessel was likely in the same class as the country’s first destroyer, unveiled April 25, which experts assessed as the North’s largest and most advanced warship to date. Kim called the first vessel, named Choe Hyon — a famed Korean guerilla fighter during the Japanese colonial period — a significant asset for advancing his goal of expanding the military’s operational range and nuclear strike capabilities.

State media described that ship as designed to handle various weapons systems, including anti-air and anti-ship weapons as well as nuclear-capable ballistic and cruise missiles. Kim said the ship was expected to enter active duty early next year and later supervised test-firings of missiles from the warship.