The ship slid off the ramp and became stuck after the flatcar failed to move alongside it, throwing off its balance and crushing parts of the ship’s bottom, according to the Korean Central News Agency.

The accident at Wednesday’s ceremony at the northeastern port of Chongjin was an embarrassing setback for Kim, who has emphasized naval advancement as key to his nuclear-armed military.

The damaged vessel was likely in the same class as the country’s first destroyer, unveiled on April 25, which experts assessed as the North’s largest and most advanced warship to date. Kim called it a significant asset for advancing his goal of expanding the military’s operational range and nuclear strike capabilities.