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= Submarines in the Royal Danish Navy = The Danish submarine programme lasted from the year 1909 until the surprising suspension of the programme in the year 2004. Danish submarines programme included several different classes of submarines throughout the programme's lifespan. The Royal Danish Navy also participated in a joint-development by Denmark, Norway and Sweden of the Viking-class submarine, to be built by the Viking Corporation. However, when the Danish submarine programme was suspended in 2004, the Viking-project was cancelled. Reasons for abandonment of the Danish submarine programme remain unclear, however, in recent years there has been debate on the restart of the submarine programme due to changing geopolitical environments in the Arctic.

History
The Danish submarine programmes was started in the year 1909 with the submarine HDMS Dykkeren. Dykkeren, however, collided with the Norwegian Steamer VESLA on October 9th 1916 and was consequently sunk. What followed was 95 years of different submarine-classes serving in the Royal Danish Navy.

On August 29th 1943 the Royal Danish Navy sank the Danish naval fleet to deny the Nazi-German occupiers the use of the Danish navy. The C, D and H-class submarines were sunk during the operation. After WWII, the Royal Danish Navy had to be rebuild with the DELFINEN-Class submarines. Before the rebuilding of the Danish submarines, The Royal Danish Navy leased the U-Class submarines from the British Royal Navy between the years 1946 and 1954. The last submarine still in commission in the Royal Danish navy was the KRONBORG, which were commissioned in 2001 and terminated in 2004. When the Danish submarine programme was terminated the KRONBORG was returned to the Swedish Royal Navy on October 27th 2004 and renamed NÄCKEN.


 * 1909 - 1917: Dykkeren
 * 1912 - 1932: A-Class
 * 1915 - 1946: B-Class
 * 1920 - 1946: C-Class (Was deliberately sunk on August 29th 1943)
 * 1926 - 1946: D-Class (Was deliberately sunk on August 29th 1943)
 * 1938 - 1950: H-Class (Was deliberately sunk on August 29th 1943)
 * 1947 - 1959: U-Class
 * 1961 - 1990: DELFINEN-Class
 * 1970 - 2004: NARHVALEN-Class
 * 1989 - 2004: TUMLEREN-Class
 * 2001- 2004: KRONBORG

A planned Joint-development by the three Nordic countries of Denmark, Sweden and Norway, with Finland as an observer was initiated in July of 1997. A total of 10 VIKING-class submarines was planned for delivery in 2009, in which Denmark and Norway would be acquiring four each, and Sweden would be acquiring only two of the submarines. Norway withdrew from the VIKING-project on June 19th 2002, following this. Sweden and Denmark was determined to continue the project When the Royal Danish Navy announced plans to terminate the use of submarine weapons systems in 2004, however, the VIKING-class submarine project was scrapped altogether, for all of the Nordic countries and the construction of the 10 planned VIKING-Class submarines was cancelled. Reasons for the Royal Danish Navy to participate in the VIKING-Class submarine project was, that the Royal Danish Navy needed a new generation of coastal submarines. It was emphasized, that the Royal Danish Navy had an expertise in conducting coastal submarine missions, having just completed a mission in the Persian Gul f with the HDMS Sælen.

Uses and missions
The Royal Danish Navy primarily employed coastal submarines (also called littoral), which excel in operating in coastal waters. These types of submarines can be used for gathering intelligence, as well as deploying special forces troops to conflict areas undetected. Seeing as the Danish military primarily participated in coalition forces missions during the post-cold war period, coastal submarines were an effective submarine weapons system for external missions of Denmark.

HDMS Sælen was dispatched to the Persian Gul f during the 2003 invasion of Iraq, to assist the Coalition forces. Being a coastal submarine, HDMS Sælen contributed the war efforts with gathering intelligence undetected in order to create a clearer aggregated intelligence picture for use by the Coalition forces in the war. HDMS Sælen served in the war for 385 days from May 2002 to June 2003.

Abandonment
The Danish submarine programme was suddenly abandoned. It was mentioned in the Defense Budget of 2005-2009, published in 2004, that the Royal Danish Navy's submarine weapons systems would be terminated

A leaked report from NATO defense planning process raised doubts about the need for Danish submarine capability in the common NATO defense. This report was widely shared in the public, and by major Danish newspapers, such as Jyllands-Posten. Earlier NATO assessments of capabilities requirements for the Royal Danish Navy stated that NATO required Denmark to have at least three coastal submarines, that Denmark could contribute to NATO. On March 3rd, in reply to the leaked report, the Ministry of Defense mentioned, that NATO would assess the need for Danish submarine capabilities to be used in the common NATO defense during the spring of 2004. Finally, it was noted in the Defense budget of 2005-2009, which was published in 2004, that the Royal Danish Navy would terminate the submarine weapons systems.

While the final decision to discontinue the submarine programme remains unclear, there has been speculation, that it was due to a lack of requirements for Danish submarine capabilities from NATO.

Debate on the restart of the submarine programme
Officially, there are no plans to restart the submarine programme of the Royal Danish Navy. In recent years, however, debate on the restart of the submarine programmes has been revitalized. The main arguments of the debates include:

Increasing great-power activity in the Arctic is widely mentioned in Danish foreign policy strategies and is also touted as a reason to increase the Royal Danish Navy's submarine capabilities. For example, Russian submarines have been spotted near Greenland, which has prompted a response from the Danish Defense ministry. Great-power activity in the Arctic is making the Arctic a more unstable area, which can be prone to increased risks of conflict, particularly between NATO and Russia. Seeing as Denmark has boundary disputes with Russia over the Continental Shelf north of Greenland, knowledge and potential counter-measures of Russian submarines becomes even more important for Danish maritime security.

The Royal Danish Navy has announced plans to increase ASW capabilities (Anti-submarine warfare), in order to counter hostile submarines in potential future conflicts. As the NATO Defence Planning Capability Review of 2019/2020 states, Denmark faces more serious threats than in any other period since the fall of the Berlin Wall. The ASW capabilities that Denmark plans to increase, however, is mainly focused on countering hostile submarines with aerial weapons systems ie. helicopters and fighter jets. The ASW capabilities could however, also include attack submarines, which specialize in finding and countering hostile submarines.

The political parties Konservative Folkeparti (Conservative People's Party) and Dansk Folkeparti (Danish People's Party) has advocated for the return of submarine capabilities to the Royal Danish Navy. Arguments include that the submarines will improve the Danish naval defense, due to their ability to gather intelligence undetected, increasing the Royal Danish Navy's ability to detect Russian submarines, which regularly cross into Danish maritime territory. In addition, it is argued that having submarines in the Royal Danish Navy can increase potential partnerships and cooperation with other allied submarine-capable states.

Expert Johannes Riber Nordby from the Danish Defense College argue, that having submarine capabilities will increase the Royal Danish Navy's deterrence force, as well as increase the ability for sovereignty enforcement on the large maritime areas of the Kingdom of Denmark, while remaining undetected. Nordby also points out, similarly to the other arguments, that having submarines will increase the sharing of information between Denmark's allied states on submarine activity in and near the Arctic. Undetected intelligence gathering of enemy submarine activity and naval activity is also mention by experts, as one of the most important reasons for acquiring submarines.

One of the main arguments against acquiring submarines for the Royal Danish Navy is the costs of submarines, as they are very expensive, compared to the relatively modest defense budget of Denmark. However experts point out the possibility of leasing submarines for a period of time, instead of acquiring new submarines for use in the Royal Danish Navy. The leasing of submarines, is not foreign to Denmark, as Denmark leased the U-class submarines in the post-war period of 1946-1954 form Great Britain.