Keel laying of future Taiwan's Indigenous Defense Submarine to be laid down in November.

According to information published by Taiwan News on November 2, 2021, a military official said that the keel of Taiwan’s first domestic submarine, called Indigenous Defense Submarine will be laid down in mid-November, “a new milestone” for the nation’s submarine project.
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A model of the future Indigenous Defense Submarine (IDS) in front of the President of the Republic of Taiwan (Picture source: Twitter account of IndoPac_Info)

The Indigenous Defense Submarine (IDS) Program is a Taiwanese project to develop and construct a class of attack submarines domestically for the Republic of China Navy.

The external design appears to resemble Japan's Soryu– and Oyashio-class SSKs by having an X-form rudder. The boats will be assembled using Japanese construction techniques in Taiwan.

Reportedly, a version of the AN/BYG-1 submarine combat management system, used in US Navy nuclear submarines, is being offered to Taiwan. Also some influence in design is thought to have come from Dutch submarines currently operated by Taiwan. The vessels are estimated to be in the 2,500-ton class and 70m in length.

Four submarines are in service with the Taiwanese Navy including two Hai Lung manufactured in the Netherlands, and two Hai Shih submarines.

The Chien Lung class of submarine, also known as the Hai Lung (Sea Dragon) class, was manufactured in the Netherlands for the Republic of China (Taiwan) and is currently in service with its navy. They are a modified version of the Dutch Navy's Zwaardvis class which itself is based on the US Barbel class.

Tench-class submarines were a type of submarine built for the United States Navy (USN) between 1944 and 1951.