‘Smiling Buddha’ at 52: Test that announced India’s nuclear arrival to the world

NEW DELHI: On the morning of May 18, 1974, deep beneath the sands of Rajasthan’s Thar desert, India detonated a nuclear device that would alter the country’s strategic trajectory forever. At 8.05 am, a controlled underground explosion shook the Pokhran test range, sending tremors far beyond India’s borders. The operation carried an almost paradoxical codename — Smiling Buddha.

The timing was symbolic as the test was conducted on Buddha Purnima, the day associated with peace and spiritual enlightenment. Yet the explosion marked India’s entry into the nuclear club, placing it among a tiny group of nations capable of mastering atomic technology. Officially, the government described it as a “peaceful nuclear explosion” (PNE). But five decades later, the debate continues: was Smiling Buddha truly peaceful, or was it India’s first atomic bomb test under another name?





The answer depends on whom one asks.

What remains undisputed, however, is that Pokhran-I transformed India’s global standing. It demonstrated scientific self-reliance, announced India’s strategic intent, triggered international sanctions, and eventually laid the foundation for the country’s declared nuclear weapons programme in 1998.



Today, 52 years after the blast, Smiling Buddha remains one of the most consequential and controversial moments in independent India’s history.

The long road to India’s nuclear programme

India’s nuclear journey began long before the Pokhran desert erupted in 1974. Soon after Independence, physicist Homi Jehangir Bhabha emerged as the architect of India’s atomic ambitions. With the support of Prime Minister Jawaharlal Nehru, Bhabha established the Tata Institute of Fundamental Research in 1945 and later shaped the Atomic Energy Commission.

Nehru publicly advocated peaceful uses of atomic energy, but he was also aware of the strategic implications of nuclear technology in a rapidly changing world. The trauma of the 1962 India-China war deeply influenced Indian security thinking. China’s successful nuclear test in 1964 intensified pressure within sections of India’s scientific and political establishment to pursue a nuclear deterrent of its own.

The nuclear programme accelerated through the 1960s under scientists such as Raja Ramanna, Homi Sethna, P. K. Iyengar and others associated with the Bhabha Atomic Research Centre (BARC).

The geopolitical atmosphere also played a role. During the 1971 India-Pakistan war, the deployment of the American aircraft carrier USS Enterprise (CVN-65) into the Bay of Bengal was viewed in New Delhi as strategic intimidation. The episode reinforced arguments inside India that the country needed stronger strategic capabilities and greater autonomy.

How the test was conducted in absolute secrecy

The Pokhran test was among the most tightly guarded operations in Indian history. Very few people inside the government knew the full details of the mission. Then Prime Minister Indira Gandhi personally supervised the project, maintaining strict secrecy even within her Cabinet.

The preparations were carried out by scientists from BARC with assistance from the Defence Research and Development Organisation (DRDO) and support from the Indian Army.

According to accounts from scientists involved in the mission, the nuclear device was transported quietly from Mumbai to Rajasthan in military vehicles. Former nuclear scientist R Chidambaram later recalled that he and colleague PR Roy travelled with the plutonium device all the way to Pokhran in a military truck, sleeping beside the container carrying the device.

The bomb itself was an implosion-type plutonium device, similar in principle to the “Fat Man” bomb used by the United States over Nagasaki in 1945. The plutonium core was developed using material from the CIRUS reactor at Trombay.

The test shaft was dug deep underground at the Pokhran Test Range in Rajasthan. The desert location ensured isolation, sparse population density, and geological suitability for containing the explosion underground.

On May 18, 1974, the device was detonated successfully.

Former BARC director Pranab Dastidar, who pressed the firing button, later recalled the event in interviews over the years. The explosion stunned the world. India had become the first country outside the five permanent members of the UN Security Council to conduct a confirmed nuclear test.

Why was it called ‘Smiling Buddha’?

The codename itself remains one of the most intriguing aspects of the operation.

The test was conducted on Buddha Purnima, the day marking the birth of Gautama Buddha. According to widely cited accounts, the successful detonation message sent to Prime Minister Indira Gandhi reportedly carried the phrase: “The Buddha has smiled.”

The symbolism was deliberate. India wanted to project the test as a controlled scientific achievement rather than an aggressive military act. The Ministry of External Affairs officially described the explosion as a “peaceful nuclear explosion”.

Interestingly, according to American military intelligence references, the operation was also referred to as “Happy Krishna”.

Yet the peaceful symbolism contrasted sharply with the global reaction. Many countries interpreted the test as India’s entry into the nuclear weapons arena regardless of the terminology used.

Why Pokhran was chosen

The choice of Pokhran was not accidental.

Pokhran lies in the Thar desert region of Rajasthan, surrounded by arid terrain, sparse habitation, rocky geology, and vast stretches of military-controlled land. These characteristics made it ideal for underground nuclear testing.

Several factors contributed to Pokhran being selected:

• Remote desert terrain: The area was isolated, reducing risks to civilian populations and helping maintain secrecy. The desert landscape also limited visibility and external observation.
• Geological suitability: The underground rock formations and dry desert conditions were suitable for containing the blast and reducing radioactive leakage.
• Military access: The site already functioned as an Indian Army test range, allowing logistical support and restricted access.
• Strategic secrecy: The remoteness of Pokhran helped India conceal preparations from foreign intelligence agencies for a considerable period, despite Cold War-era satellite surveillance.

Pokhran would later gain even greater historical importance when India returned to the same desert in May 1998 for the Pokhran-II nuclear tests under Prime Minister Atal Bihari Vajpayee.

Bomb or peaceful nuclear explosion? The debate that never ended

Perhaps no aspect of Smiling Buddha has generated more debate than the question of whether it was genuinely a peaceful nuclear explosion.

India’s official position in 1974 was clear: the test was conducted for peaceful purposes and civilian applications. Indian officials argued that underground nuclear explosions could potentially be used in mining, engineering, excavation, and large-scale infrastructure projects.

Former nuclear scientist Anil Kakodkar, who was associated with the project, later defended this interpretation.

“The test was a PNE having several useful civilian applications,” Kakodkar told The Times of India.

He further said: “The test created a sense of confidence but also posed challenges as we had to beat the embargoes which followed. However, this made us more self-reliant.”

But others directly contradicted the “peaceful” description.

In a 1997 interview to PTI, Raja Ramanna openly rejected the PNE characterisation.

“It was a bomb. I can tell you now … an explosion is an explosion, a gun is a gun whether you shoot at someone or shoot at the ground. I just want to make it clear that the test was not all that peaceful,” Ramanna said.

He also acknowledged that the PNE narrative functioned as political cover for a programme that aimed from the beginning to develop nuclear weapons capability.

The controversy partly stemmed from the origins of the plutonium used in the device. The material came from the CIRUS reactor supplied by Canada, with heavy water support from the United States under agreements intended for peaceful purposes.

When news of the test emerged, both countries reacted sharply.

The world reacts: Sanctions, shock and strategic consequences

The Pokhran test shocked the international community.

The United States and Canada voiced strong opposition, especially because foreign-supplied nuclear material had contributed to the programme. Canada froze nuclear cooperation with India, while global non-proliferation concerns intensified.

One of the biggest long-term consequences of the test was the formation of the Nuclear Suppliers Group (NSG), created to restrict nuclear exports and prevent proliferation.

India suddenly found itself facing technology denial regimes and international restrictions.

Yet many Indian scientists later argued that these sanctions unintentionally strengthened India’s indigenous capabilities. Denied access to foreign technology, Indian researchers developed domestic expertise across multiple sectors of nuclear science and engineering.

At home, the political reaction was dramatically different.

Indira Gandhi’s popularity surged after the test. Many Indians viewed the achievement as proof that the country could stand independently among major powers despite technological restrictions and geopolitical pressure.

The science behind the device

The device tested at Pokhran was an implosion-type plutonium bomb.

Scientists at BARC engineered and assembled the device in India. The bomb reportedly weighed around 1,400 kilograms and measured about 1.25 metres in diameter.

The design relied on conventional explosives arranged around a plutonium core. When detonated simultaneously, the explosives compressed the plutonium inward, triggering a nuclear chain reaction.

The exact explosive yield remains disputed even today.

Official Indian estimates initially placed the yield at around 12 kilotons. However, several external analysts estimated lower figures ranging between 4 and 8 kilotons based on seismic data and crater analysis.

Later statements by scientists involved in the project suggested the actual yield may have been closer to 8 kilotons.

Regardless of the precise number, the test established India’s ability to design, build, and detonate a functioning nuclear device.

Secrecy, symbolism and strategic messaging

One reason Smiling Buddha occupies such a unique place in Indian history is the blend of secrecy and symbolism surrounding it.

The operation was hidden not only from foreign governments but even from many senior Indian officials. Cabinet ministers reportedly received little or no advance information. The military itself was informed on a need-to-know basis.

At the same time, the codename and official description projected restraint rather than aggression.

India sought to walk a careful diplomatic line. It wanted to demonstrate technological capability without formally declaring itself a nuclear weapons state.

That ambiguity would continue for decades.

Unlike the five recognised nuclear powers under the Nuclear Non-Proliferation Treaty (NPT), India never signed the treaty, arguing that it institutionalised inequality by permanently dividing the world into nuclear “haves” and “have-nots”.

For years after 1974, India maintained strategic ambiguity while steadily developing its nuclear capabilities.

The human side of Pokhran

While Smiling Buddha is often remembered through the lens of geopolitics and national security, the test also affected local communities around Pokhran.

Villages located near the test site reportedly experienced concerns over crop damage, health issues, and environmental effects in the years following the explosion. Some residents later alleged increases in cancer cases, skin irritation, and livestock problems.

However, definitive epidemiological studies establishing direct links between the blast and long-term health effects have remained limited and inconclusive.

The government compensated villagers living near the test area, though many locals later argued that awareness about radiation risks and long-term impacts was inadequate at the time.

From Smiling Buddha to Pokhran-II

After the 1974 test, India did not immediately conduct further nuclear explosions. For nearly 24 years, the country maintained ambiguity while continuing nuclear research and weapons-related development.

That changed in May 1998. Under Operation Shakti, India conducted a series of nuclear tests again at Pokhran, this time openly declaring itself a nuclear weapons state. The tests under Prime Minister Atal Bihari Vajpayee included both fission and thermonuclear devices.

Pokhran-II effectively ended the strategic ambiguity that had defined the post-1974 period.

Yet the scientific, political, and institutional foundations of 1998 were built on the groundwork laid by Smiling Buddha.

Why Smiling Buddha still matters

More than five decades later, Smiling Buddha remains deeply relevant to India’s strategic identity.

The test represented far more than a scientific experiment. It reflected India’s determination to pursue technological autonomy despite international pressure. It reshaped India’s global image, altered South Asian geopolitics, and accelerated the nuclearisation of the region.

The debate over whether it was a bomb or a peaceful explosion may never fully disappear. But history has largely settled one question: Pokhran-I marked the moment India crossed the nuclear threshold.

The explosion beneath the Rajasthan desert on May 18, 1974 did not merely shake the earth. It announced that India intended to chart its own strategic course — on its own terms.