Forbes reported that a Japanese military submarine collided with a civilian vessel during exercises in waters off southern Japan .
The Maritime Self-Defense Forces submarine grazed against an unidentified civilian cargo ship during surfacing exercises about 30 miles off the southeastern coast of Miyazaki on Japan's southern island of Kyushu, according to the repot.
No injuries were reported among crew members of the submarine Asashio, but officials have found a dent in the vessel's topside. It is said that the submarine apparently hit the vessel's hull while surfacing.
The number of crew members and the direction the submarine was heading could not be released
The vessel might not have noticed the incident due to the minor impact, he added.