The Asashio was cruising submerged with its periscope up when the crew felt a shock. It made contact with the tanker at around 9:49 a.m. Because the sub crew did not immediately realize the cause of the impact, it maintained course, the MSDF officials said.The article also has a picture of the sub's damaged rudder; I wouldn't want to submerge in that thing until it gets fixed:
According to the Japan Coast Guard, the tanker also kept to its course, unaware that the impact it felt came from a submarine.
Later in the day, the tanker arrived at Shibushi port in Kagoshima Prefecture to undergo an inspection, and the Asashio arrived at Aburatsu port, as instructed by Japan Coast Guard, for questioning, the MSDF said.
(Note for non-submariners: The rudder is supposed to be vertical.)
Staying at PD...