Type 093 submarine

The Type 093 submarine (NATO reporting name: Shang class) is a class of nuclear-powered attack submarines constructed by the People's Republic of China for the People's Liberation Army Navy (PLAN).

Development
The first-generation of Chinese nuclear submarines, the Type 091 attack and the Type 092 ballistic missile submarines (SSBN), were costly for their limited capability. There was little political support for further development after the Cultural Revolution; they were not a priority in Deng Xiaoping's Four Modernizations. Research on design and foreign developments continued throughout the 1980s, with a new reactor design in development by 1987. Support for new nuclear submarines emerged in 1994 under Jiang Zemin after the 1993 Yinhe incident and continued tensions with Taiwan. Reportedly, Russian experts contributed to the Type 093's design. The first boat was laid down in 1994 and commissioned in 2006. The first two boats had unsatisfactory speed and noise. Further boats were delayed to free yard capacity for the Type 094 SSBN.

The four Type 093A boats, commissioned from 2015-2018, introduced longer streamlined sails for greater speed. The first two Type 093As were also relatively quieter by incorporating acoustic dampening technology developed from Kilo-class submarines purchased from Russia. The last two Type 093As may have been further improved by using acoustic dampening mounts derived from later Russian technology, possibly making them China's "first quiet submarine."

The first Type 093B emerged from the building hall in January 2023 with pump-jet propulsion.

Unverified accident in August 2023
On 21 August 2023, Lude Media, an anti-Chinese Communist Party social media organization run by Wang Dinggang, reported that a Type 093 had been lost with its entire crew around the Taiwan Strait. The report was unsubstantiated. On August 22, Taiwan's Ministry of National Defense reported its intelligence and surveillance had not detected an incident. China denied the report as "completely false" on August 31.

The allegation was revived on 3 October 2023 by the Daily Mail, a British tabloid, which cited "a secret UK report"; it reported that submarine "093-417" collided with an anti-submarine net in the Yellow Sea, the atmosphere control equipment was damaged, six hours of repairs were required to surface, and 55 crew were killed by hypoxia. The report was repeated by The Times. On October 5, Taiwan-based UP Media, citing anonymous Chinese sources, reported that the accident was caused by an onboard Yu-3 torpedo explosion. Analysts were skeptical. On the Daily Mail report, Thomas Shugart, a retired submariner and analyst for the Center for a New American Security, said "I've never heard of submarine nets being used on the high seas, and I don't understand why snagging one would cause a failure of atmosphere control equipment" and that "(s)ix hours is not enough to result in hypoxia without something else consuming the oxygen first, like a fire or explosion." Chris Carlson, a retired submariner and US naval intelligence analyst, commented on the UP Media report by saying "(t)he problem is the vast majority of the reporting (...) is from Taiwanese sources that have some credibility issues" and that the details required verification.

Type 093
Two Type 093s were built, with the NATO reporting name Shang I.

The boat uses a similar teardrop hull as the Type 091, and also has the same pressure hull width of 9 meters. Acoustic dampening likely uses a Chinese compound isolation system, similar to those used by European conventional submarines. The Type 093 had a noise level similar to the Soviet Project 671 (NATO reporting name Victor I) which entered service in the late-1960s.

In 2013 to 2015, one boat's sail was streamlined with a small cusp or fillet at the bottom of leading edge and a slight round down at the top of the sail, estimated to reduce drag by 15-30%.

Type 093A
Four Type 093As were built, with the NATO reporting name Shang II.

These boats have a streamlined sail lengthened by 2.5 meters to reach the Type 093's design speed of 30 knots, a stern towed array sonar deployment tube, and a hump behind the sail; the hump is likely for the towed array handling gear and is not a vertical launching system (VLS). The hump was box-like on the first boat, tall and streamlined on the second, and low and streamlined on the third and fourth.

The Type 093As were some of the first Chinese submarines to incorporate Russian acoustic dampening technology imported starting in the 1990s. China imported Kilo submarines in the 1990s, with Project 877EKM including anechoic tiles, and Project 636 including pneumatic isolation mounts; Chinese derivatives of these components were installed on the first two Type 093As giving them a noise level similar to the Soviet Project 671RT (NATO reporting name Victor II) which entered service in the early 1970s.

China may have acquired components or data in the early-2000s for the later-generation APRKu pneumatic isolation mounts used by Russian third and fourth generation submarines, and used it to develop the JYQN mount which was patented in 2012. The last two Type 093As may have received JYQN mounts, possibly giving the boats noise levels like early Project 671RTM (NATO reporting name Victor III) which entered service in the late-1970s.

Type 093B
One Type 093B is under construction, with the NATO reporting name Shang III.

The boat has a pump-jet propulsor that slightly increases overall length. The United States classifies it as a cruise-missile submarine but it likely does not have a VLS. Chinese proficiency in precision manufacturing since 2012-2013 may result in a noise levels like the Soviet Project 945 (NATO reporting name Sierra I) that launched in 1983.