Mitsubishi Launches Latest Maritime Survey Vessel for Japanese Navy

Mitsubishi Heavy Industries has rolled out a new oceanographic research vessel for the Japan Maritime Self-Defense Force in Shimonoseki, Yamaguchi Prefecture.

Named JS Akashi (AGS-5107), the ship will be one of Tokyo’s primary assets to collect data on seafloor topography, temperature, and maritime resources to benefit future naval operations and scientific studies.

It is named after the coastal city of Akashi in Hyogo Prefecture, among Japan’s critical regions for defense equipment production, particularly aircraft, during the Second World War.

Following its inauguration and christening, the platform will undergo additional outfitting and receive main electronic capabilities before its official acceptance into service in March 2026.

The Akashi will coordinate alongside other Japanese survey vessels operating across key areas of responsibility, including the JS Nichinan (AGS-5105), the JS Shōnan (AGS-5106), and their Futami-class predecessors.

It will sail under the Yokosuka-based First Ocean Observation Squadron, which utilizes surface and airborne fleets, including the Kawasaki-P1 maritime patrol aircraft, to oversee intelligence and monitoring of potential threats nationwide.

The JS Akashi

According to local Japanese news sources, the Akashi’s construction cost approximately 28 billion yen ($193.8 million).

It is 114 meters (374 feet) long, 18 meters (59 feet) wide, and accommodates up to 90 personnel.

Although details of its specifications are limited, the Akashi will likely have components similar to those of other naval research vessels, including three Mitsubishi-made diesel-electric engines and various advanced multi-domain sensors.

Compared to the design of similar vessels, the Akashi could have a top speed of about 20 knots (37 kilometers/23 miles per hour).