Japan Navy sends icebreaker AGB Shirase on Antarctic expedition.

According to information published by the Japanese MoD on November 12, 2023, the Japan Maritime Self-Defense Force (JMSDF) icebreaker AGB Shirase set sail from Yokosuka for its 65th Antarctic research expedition. The icebreaker is headed towards the Showa base in Antarctica, where it will undertake extended support missions integral to Japan's ongoing research efforts in the region.
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Japanese icebreaker AGB Shirase. (Picture source: JMSDF)

The Shirase, designated with the hull number AGB-5003, is an icebreaker operated by the Japan Maritime Self-Defense Force. This vessel, launched in April 2008 and commissioned in May 2009, represents the fourth generation of Japanese icebreakers dedicated to Antarctic expeditions. It carries the legacy of its namesake, continuing a lineage of exploration and research.

On its maiden voyage, which commenced on November 10, 2009, the Shirase set out to demonstrate its capabilities in challenging icy environments. With a displacement of approximately 20,000 tons, the vessel measures 138 meters (452 feet 9 inches) in length, has a beam of 28 meters (91 feet 10 inches), and a draft of 9.2 meters (30 feet 2 inches).

Powered by a diesel-electric propulsion system, the Shirase is equipped with four propulsion motors, generating a combined power of 22,000 kW (30,000 horsepower). This power is transmitted through two shafts with fixed-pitch propellers. The ship can reach a maximum speed of 19.5 knots (36.1 km/h; 22.4 mph) and is capable of maintaining a speed of 3 knots (5.6 km/h; 3.5 mph) while breaking through ice up to 1.5 meters (4.9 feet) thick.

Designed to support scientific research, the Shirase can accommodate up to 80 scientists and has the capacity to carry 1,100 tons of cargo. It has a complement of 175 crew members and is equipped to carry three helicopters, further enhancing its operational range and capabilities in Antarctic expeditions.