paragraph_text: Underground tests in the United States continued until 1992 (its last nuclear test), the Soviet Union until 1990, the United Kingdom until 1991, and both China and France until 1996. In signing the Comprehensive Nuclear - Test - Ban Treaty in 1996, these states have pledged to discontinue all nuclear testing; the treaty has not yet entered into force because of failure to be ratified by eight countries. Non-signatories India and Pakistan last tested nuclear weapons in 1998. North Korea conducted nuclear tests in 2006, 2009, 2013, 2016, and 2017. The most recent confirmed nuclear test occurred in September 2017 in North Korea.

paragraph_text: After Indira Gandhi became Prime Minister in 1966, the nuclear program was consolidated when physicist Raja Ramanna joined the efforts. Another nuclear test by China eventually led to India's decision toward building nuclear weapons in 1967 and conducted its first nuclear test, Smiling Buddha, in 1974.

paragraph_text: Deoksancheon is a river of South Korea. It is a tributary of the Hongcheon River in the Han River system. The river is located in a high altitude area. There are alluvium deposits along the lower end of the stream.

paragraph_text: The nuclear arms race was a competition for supremacy in nuclear warfare between the United States, the Soviet Union, and their respective allies during the Cold War. During this period, in addition to the American and Soviet nuclear stockpiles, other countries developed nuclear weapons, though none engaged in warhead production on nearly the same scale as the two superpowers.

paragraph_text: Korea Hydro & Nuclear Power (, KHNP) is a subsidiary of the Korea Electric Power Corporation (KEPCO). It operates large nuclear and hydroelectric plants in South Korea, which are responsible for about 30% of the country's electric power supply. It was formally established in 2001 as part of a general restructuring at KEPCO, although KEPCO had opened its first nuclear plant at Kori in Busan in 1977. The first commercial operation of Kori nuclear #1 was held 1978.

paragraph_text: South Korea is located in East Asia, on the southern half of the Korean Peninsula jutting out from the far east of the Asian land mass. The only country with a land border to South Korea is North Korea, lying to the north with 238 kilometres (148 mi) of border running along the Korean Demilitarized Zone. South Korea is mostly surrounded by water and has 2,413 kilometres (1,499 mi) of coast line along three seas; to the west is the Yellow Sea (known in Korea as West Sea), to the south is the East China Sea, and to the east is the Sea of Japan (known in Korea as East Sea). Geographically, South Korea's land mass is approximately 100,032 square kilometres (38,623 sq mi). 290 square kilometres (110 sq mi) of South Korea are occupied by water. The approximate coordinates are 37 ° North, 127 ° 30 East. Notable islands include Jeju Island (Jejudo), Ulleung Island (Ulleungdo), and Liancourt Rocks (Dokdo, known in Japan as Takeshima).

paragraph_text: United States Nuclear program start date 21 October 1939 First nuclear weapon test 16 July 1945 First fusion weapon test 1 November 1952 Last nuclear test 23 September 1992 Largest yield test 15 Mt / 63 PJ (1 March 1954) Total tests 1,054 detonations Peak stockpile 31,255 warheads (1967) Current stockpile (usable and not) 4,000 (2018) (excludes retired and awaiting dismantlement) Current strategic arsenal 1,800 deployed strategic nuclear warheads (2018) Maximum missile range 15,000 km (9,321 mi) (land) 12,000 km (7,456 mi) (sub) NPT party Yes (1968, one of five recognized powers)

paragraph_text: North Korea has a military nuclear weapons program and also has a significant quantity of chemical and biological weapons. As of 2003, North Korea is no longer a party to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). The country has come under sanctions after conducting a number of nuclear tests, beginning in 2006.

paragraph_text: Koeberg Alert is an anti-nuclear activist organisation formed in 1983 as a local campaign against South Africa's nuclear programme, in particular the construction of Koeberg Nuclear Power Station. It is possibly the country's first activist green movement, apart from Nan Rice's Dolphin Action and Protection Group. For years it was allied to the broader democratic and anti-apartheid movement. It currently organises various anti-nuclear campaigns, as well as participates in the wider anti-war and peace movements.

paragraph_text: India's decision to conduct nuclear tests in May 1998 and Pakistan's response set back US relations in the region, which had seen renewed US interest during the second Clinton Administration. A presidential visit scheduled for the first quarter of 1998 was postponed and, under the Glenn Amendment, sanctions restricted the provision of credits, military sales, economic assistance, and loans to the government.

paragraph_text: Country Warheads (Deployed / Total) Date of first test Test site of first test CTBT status Delivery methods Number of tests The five nuclear - weapon states under the NPT United States 1,800 / 6,800 16 July 1945 (``Trinity '') Alamogordo, New Mexico Signatory Nuclear triad 1,054 Russia 1,950 / 7,000 29 August 1949 (`` RDS - 1'') Semipalatinsk, Kazakhstan Ratifier Nuclear triad 715 United Kingdom 120 / 215 3 October 1952 (``Hurricane '') Monte Bello Islands, Australia Ratifier Sea - based 45 France 280 / 300 13 February 1960 (`` Gerboise Bleue'') Sahara, French Algeria Ratifier Sea - and air - based 210 China? / 270 16 October 1964 (``596 '') Lop Nur, Xinjiang Signatory Suspected nuclear triad. 45 Non-NPT nuclear powers India 0 / 110 -- 120 18 May 1974 (`` Smiling Buddha'') Pokhran, Rajasthan Non-signatory Nuclear triad 6 Pakistan 0 / 120 -- 130 28 May 1998 (``Chagai - I '') Ras Koh Hills, Balochistan Non-signatory Land and air - based. 6 North Korea 0 /? 9 October 2006 Kilju, North Hamgyong Non-signatory Suspected land and sea - based. 6 Undeclared nuclear powers Israel n.a. / est. 60 -- 400 1960 -- 1979 incl. suspected Vela Incident Signatory Suspected nuclear triad.

paragraph_text: The 2006 North Korean nuclear test was the detonation of a nuclear device conducted by North Korea on October 9, 2006.

paragraph_text: Operation Sunbeam was a series of four nuclear tests conducted at the United States of America's Nevada Test Site in 1962. "Operation Sunbeam" tested small, "tactical" nuclear warheads; the most notable was the "Davy Crockett". "Operation Sunbeam" was also known as "Operation Dominic II".

paragraph_text: Pokhran - II was the series of five nuclear bomb test explosions conducted by India at the Indian Army's Pokhran Test Range in May 1998. It was the second Indian nuclear test; the first test, code - named Smiling Buddha, was conducted in May 1974.

paragraph_text: The Pacific Proving Grounds was the name given by the United States government to a number of sites in the Marshall Islands and a few other sites in the Pacific Ocean at which it conducted nuclear testing between 1946 and 1962. The U.S. tested a nuclear weapon (codenamed Able) on Bikini Atoll on 30 June 1946. This was followed by Baker on July 24, 1946.

paragraph_text: During the early years of the Cold War from 1946 to 1958, the United States tested 67 nuclear weapons at its Pacific Proving Grounds located in the Marshall Islands, including the largest atmospheric nuclear test ever conducted by the U.S., code named Castle Bravo. "The bombs had a total yield of 108,496 kilotons, over 7,200 times more powerful than the atomic weapons used during World War II." With the 1952 test of the first U.S. hydrogen bomb, code named "Ivy Mike," the island of Elugelab in the Enewetak atoll was destroyed. In 1956, the United States Atomic Energy Commission regarded the Marshall Islands as "by far the most contaminated place in the world."

paragraph_text: The Pokhran - II tests were a series of five nuclear bomb test explosions conducted by India at the Indian Army's Pokhran Test Range in May 1998. It was the second instance of nuclear testing conducted by India; the first test, code - named Smiling Buddha, was conducted in May 1974.

paragraph_text: After the dissolution of the Soviet Union, Ukraine inherited a 780,000-man military force on its territory, equipped with the third-largest nuclear weapons arsenal in the world. In May 1992, Ukraine signed the Lisbon Protocol in which the country agreed to give up all nuclear weapons to Russia for disposal and to join the Nuclear Non-Proliferation Treaty as a non-nuclear weapon state. Ukraine ratified the treaty in 1994, and by 1996 the country became free of nuclear weapons.Ukraine took consistent steps toward reduction of conventional weapons. It signed the Treaty on Conventional Armed Forces in Europe, which called for reduction of tanks, artillery, and armoured vehicles (army forces were reduced to 300,000). The country plans to convert the current conscript-based military into a professional volunteer military.

paragraph_text: Operation Project 56 was a series of 4 nuclear tests conducted by the United States in 1955-1956 at the Nevada Test Site. These tests followed the "Operation Wigwam" series and preceded the "Operation Redwing" series.

paragraph_text: Operation Anvil was a series of 21 nuclear tests conducted by the United States in 1975-1976 at the Nevada Test Site. These tests followed the "Operation Bedrock" series and preceded the "Operation Fulcrum" series.

Question: When did the neighboring country of where Deoksancheon is located conduct its first nuclear test?
Answer: October 9, 2006