The U.S. Army secretly planned to hide hundreds of nuclear missiles in tunnels under the Greenland ice
Where the evidence lands: Supported
That behind the celebrated scientific research station Camp Century lay Project Iceworm — a genuine U.S. Army program to excavate a 4,000-kilometer network of tunnels under the Greenland ice sheet and deploy up to 600 mobile nuclear missiles (a shortened Minuteman variant the Army wanted to call the 'Iceman'), served by 60 launch control centers and thousands of soldiers living permanently under the ice, all without the knowledge or consent of Denmark, the country that owned Greenland.
Believed by: Accepted as documented Cold War history since the 1997 Danish disclosure
The full story
A city under the ice, and the thing it was really testing
In 1960 the U.S. Army invited the world to marvel at Camp Century, an outpost cut into the Greenland ice sheet about 150 miles from the big air base at Thule. Newsreels and a Boy Scout visitor described a genuine subterranean town: some twenty-one snow tunnels roofed with steel arches, holding barracks, a mess hall, a hospital, a chapel, a laboratory, a library, even a theater, all a few meters below the surface and warm enough to live in year-round. Its most futuristic feature was power. A portable reactor called the PM-2A, assembled from parts flown onto the ice cap and billed as the world's first mobile nuclear power plant, supplied the camp's heat and electricity from 1960 until it was removed in 1964. Officially, Camp Century existed to study how to build and operate in the Arctic and to do polar science.
The science was real — that is the strange heart of this story. Glaciologists working at the camp drilled the first ice core ever taken all the way through the sheet, roughly 1,390 meters, and a few meters into the bedrock beneath it in 1966. That core is still studied today; it helped launch the entire field of ice-core climate reconstruction. But underneath the public marvel sat a classified purpose the visitors were never told about. Camp Century was also the feasibility test for Project Iceworm: a plan to turn the Greenland ice sheet into a hidden launch platform for hundreds of nuclear missiles aimed at the Soviet Union.
What the declassified Army documents actually confirm
The strongest case for Project Iceworm is, unusually, the officially documented one. The plan stayed secret for decades, but it did not stay secret because it was a fantasy — it was withheld because it was a real, funded U.S. Army concept. When the Danish Institute of International Affairs (DUPI) investigated the history of nuclear weapons in Greenland in the mid-1990s, prompted in part by the fallout from the 1968 crash of a nuclear-armed B-52 near Thule, its researchers obtained and published a set of declassified American documents. Among them was a 1960 Army study bluntly titled Strategic Value of the Greenland Icecap. Iceworm became public knowledge for the first time in 1997, not through a leak or a whistleblower, but through an allied government's formal inquiry into its own soil.
What those documents describe is remarkable in scale. The Army envisioned a tunnel network on the order of 4,000 kilometers (about 2,500 miles) carved into the ice, housing up to 600 nuclear missiles— a shortened, two-stage version of the Air Force's Minuteman that the Army proposed calling the “Iceman.” The missiles were to be shuffled between firing positions along the trenches so the Soviets could never be sure where they were, a mobile-basing idea meant to survive a first strike. Supporting them would be some 60 launch control centers and, by the plan's own estimate, on the order of 11,000 soldiers living under the ice. Camp Century, with its tunnels cut by the same rotary snow plows and powered by a portable reactor, was the working prototype for exactly this kind of habitation.
The cover held for so long precisely because so much of it was true. A front that produces genuine, publishable, celebrated science — an under-ice base that really did run a reactor, really did house researchers, really did drill a historic ice core — is far harder to see through than an empty shell. The public was not shown a fake base hiding an empty room; it was shown a real base whose second, classified purpose simply never made it into the newsreels.
The ice that would not hold still
The honest counterweight to any breathless telling of Iceworm is that it never actually happened, and it failed for a mundane, physical reason: the ice would not cooperate. Planners had treated the Greenland ice sheet as a more or less solid, stable foundation. The measurements taken at Camp Century said otherwise. Within a few years, the glaciological data showed the ice deforming and flowing far faster than assumed. The tunnels that had looked so permanent in the 1960 footage were being squeezed and displaced; ceilings had to be trimmed, and engineers calculated that missile trenches would be crushed or dangerously distorted within roughly two years of being dug.
That finding was fatal to the whole premise. The entire strategic appeal of Iceworm was a stable, hidden, survivable grid the Soviets could not target. An ice sheet that slowly ground its own tunnels shut could not host hundreds of nuclear missiles safely. The PM-2A reactor was pulled out in 1964, the camp was reduced to summer use, and by1966–1967 both Camp Century and Project Iceworm were effectively abandoned. No “Iceman” missile was ever built or deployed under the ice; the 600-missile grid never advanced past planning and a single prototype station.
It is worth stating plainly what is and is not established. The plan, the missile numbers, the tunnel concept, and the deliberate secrecy toward Denmark are all documented in declassified records. What never existed was the deployed weapon system itself. Iceworm belongs in the category of a real, serious plan that was tested and killed by its own engineering data — not a secret arsenal that was ever actually fielded and then hidden.
Why the cover story still stings in Copenhagen
Part of what keeps Iceworm alive is not the missiles that were never launched but the country that was never told. Greenland was Danish territory, and Denmark had a standing policy against nuclear weapons on its soil. The Danish government approved Camp Century as a research and Arctic-engineering station. It was never told that the base doubled as the groundwork for an American nuclear missile field — the classified Iceworm objective was withheld from the very ally hosting it. When the DUPI documents surfaced in the 1990s, that omission landed as a real political scandal in Denmark, entangled with the separate, bitter controversy over U.S. nuclear weapons staged through Thule and the 1968 crash.
This is why Iceworm reads less like a debunked rumor and more like a case study in how a cover story works when it is built on a foundation of truth. Nobody had to fabricate a fake science mission; they simply declined to mention the other half of the plan. The public got an inspiring story about human ingenuity in the Arctic, and it was accurate as far as it went. The part that was omitted — the reason a nuclear reactor and eleven thousand hypothetical soldiers were being contemplated for the ice cap — was the part that would have changed how everyone, Danes included, understood the whole project.
There is a final twist that gives the story a strange afterlife. Planners assumed the abandoned base would be entombed by falling snow forever, so they simply left it: the structures, some 200,000 liters of diesel fuel, untreated sewage, PCB-laden materials, and the reactor's low-level radioactive coolant. A 2016 study led by glaciologist William Colgan in Geophysical Research Letters warned that climate change could break that assumption — that if the Greenland ice shifts from gaining mass to melting, the waste could be re-exposed within the coming century or two, reopening the question of who is responsible for cleaning up a secret that was supposed to stay frozen.
Where the evidence lands
On the core claim — that the U.S. Army genuinely planned to base hundreds of nuclear missiles in tunnels under the Greenland ice, and built Camp Century as both a proof-of-concept and a public cover — the verdict is Substantiated. This is not an inference from suspicious circumstances. It rests on declassified U.S. Army documents, including the 1960 report Strategic Value of the Greenland Icecap, brought into the open by a formal Danish government inquiry in the 1990s and corroborated by the engineering record of Camp Century itself.
The important precision is on scope. Project Iceworm was a real plan that reached prototype stage and was then cancelled — not a deployed missile system that was later concealed. No “Iceman” missile was ever placed under the ice; the scheme died because the ice sheet flowed and deformed far faster than planners believed, crushing the tunnels the whole concept depended on. What remains genuinely live is the aftermath: an allied nation kept in the dark on its own territory, and a cache of Cold War waste that the 1960s assumed the ice would hide forever, now facing a warming climate that may hand the secret back. Camp Century turns out to be the rare cover story that did real science, hid a real war plan, and left a real mess — all at once.
Point by point
The claim: Camp Century was not just a science station — it was cover for a secret nuclear missile plan.
What the record shows: Confirmed by the declassified U.S. Army record itself. Documents released through the Danish DUPI inquiry in 1997, including the 1960 Army report 'Strategic Value of the Greenland Icecap,' describe Project Iceworm as a plan to base up to 600 missiles under the ice, with Camp Century serving as the publicly acknowledged proof-of-concept for living and building on the ice cap. This is the U.S. Army's own paperwork, not an outside allegation.
The claim: The Army wanted to deploy hundreds of nuclear missiles in a giant grid of ice tunnels.
What the record shows: Confirmed as a genuine plan, though never built. The declassified concept called for roughly 600 missiles — a shortened Minuteman variant the Army wanted to call the 'Iceman' — dispersed across a tunnel network on the order of 4,000 km, served by about 60 launch control centers. It never advanced past planning and prototype: no missiles were ever placed under the ice, and Danish consent to nuclear deployment was never sought or given.
The claim: Denmark, which owned Greenland, was kept in the dark about the missile purpose.
What the record shows: Confirmed, and this is the sharpest part of the cover story. Denmark approved Camp Century as a research and Arctic-testing station; the classified missile-basing objective behind it was deliberately withheld from the Danish government. The gap became a genuine political controversy in Denmark once the documents surfaced in the 1990s, tangled together with the separate scandal over U.S. nuclear weapons at Thule.
The claim: The plan was abandoned because the ice sheet was too unstable to hold it.
What the record shows: Confirmed by the base's own engineering and glaciological data. Within a few years, measurements at Camp Century showed the ice deforming and flowing far faster than planners had assumed — the tunnels were being crushed and displaced, and the reactor was pulled out in 1964. The same ice movement that doomed a hidden missile field also produced the landmark 1966 ice core, making the science and the failure two sides of the same finding.
Timeline
- 1951Under a U.S.–Denmark defense agreement, the United States gains broad rights to build and operate military installations in Greenland, including the large air base at Thule (now Pituffik) in the far northwest — the logistical anchor that later makes an under-ice base possible.
- 1959-06The U.S. Army Corps of Engineers begins construction of Camp Century on the ice sheet about 150 miles east of Thule, cutting a grid of trenches into the snow with Swiss-made 'Peter Plow' rotary cutters and roofing them with steel arches, then letting snow drift over the top.
- 1960Camp Century is completed: roughly 21 interconnected tunnels totaling nearly two miles, housing barracks, a mess hall, hospital, laboratory, chapel, store, and even a theater for up to 200 personnel, all buried a few meters beneath the surface. The Army publicizes it heavily as a peaceful Arctic science station.
- 1960-10The portable PM-2A nuclear reactor — assembled from components flown to the ice cap and billed as the world's first 'mobile' nuclear power plant — goes critical and begins supplying the camp's heat and electricity. A 1960 Army report, 'Strategic Value of the Greenland Icecap,' lays out the case for using the ice sheet as a missile basing area.
- 1960–1963Under the classified Project Iceworm concept, Army planners study deploying up to 600 nuclear missiles — a shortened two-stage version of the Minuteman the Army proposed calling the 'Iceman' — across a tunnel grid some 4,000 km (2,500 mi) long, with 60 launch control centers and about 11,000 soldiers living under the ice. The plan is never shared with the Danish government.
- 1963–1966Glaciologists based at Camp Century drill the first ice core all the way through the sheet — about 1,390 meters — and a few meters into the bedrock beneath, a genuine scientific triumph. The same glaciological work reveals that the ice is deforming and flowing far faster than assumed.
- 1964–1965Measurements show the tunnels are steadily crushing and shifting as the ice moves; the PM-2A reactor is shut down and removed in 1964, and the camp is scaled back to summer-only use. Engineers conclude that missile trenches would be deformed and endangered within a couple of years of construction.
- 1966–1967Camp Century is effectively abandoned and Project Iceworm is quietly cancelled: the Greenland ice proves too mobile to host a stable, hidden missile base. The tunnels, and the waste left behind — diesel fuel, sewage, PCBs, and the reactor's low-level radioactive coolant — are left to be buried by falling snow, presumed entombed forever.
- 1995–1997The Danish Institute of International Affairs (DUPI), investigating the history of nuclear weapons in and around Greenland after the 1968 Thule B-52 crash, uncovers and publishes the declassified Iceworm documents. Project Iceworm becomes public for the first time, revealing that Denmark had unknowingly hosted the groundwork for an American nuclear missile field.
- 2016A study led by glaciologist William Colgan in Geophysical Research Letters warns that climate change could reverse the assumption of permanent burial: if the ice sheet shifts from net accumulation to net melting, Camp Century's abandoned physical, chemical, and radioactive waste could be re-exposed within the coming century or two.
Supported. Confirmed by declassified U.S. Army documents published by a Danish government inquiry in 1997: the Army genuinely planned to deploy up to 600 nuclear missiles in a tunnel network under Greenland, and built the publicly celebrated research station Camp Century — nuclear reactor and all — as both a proof of concept and a cover. The missiles were never fielded; unstable, flowing ice killed the plan.
Sources
- 1.Project Iceworm — Wikipedia (2026)
- 2.Camp Century — Wikipedia (2026)
- 3.When the Pentagon Dug Ice Tunnels in Greenland to Hide Nukes — History.com (A&E Television Networks) (2023)
- 4.The abandoned ice sheet base at Camp Century, Greenland, in a warming climate — W. Colgan et al., Geophysical Research Letters (AGU) (2016)
- 5.Camp Century — Atomic Heritage Foundation / National Museum of Nuclear Science & History (2017)
- 6.Camp Century: The secret Arctic military base beneath the Greenland ice — CNN (2025)
- 7.What this secret nuclear base in Greenland can tell us about climate change — National Geographic (2020)