The Japanese Navy lost a USD 5.7 million worth unmanned submarine last year, according to AFP.
The submarine was being used in the Tsugaru Strait, a channel located between the Japanese islands of Honshu and Hokkaido, in November last year, for collecting data from the underwater terrain in the area.
The Navy conducted a nine-day search of the sea floor but it hasn’t found the submarine, which vanished after her cable had severed.
The Japanese Ministry will investigate the cause of the vehicle’s disappearance.
Naval Today Staff, January 29, 2014; Image: Wikimedia