KeysQuestions4Vehicle1<\/p>\n
The Deep Underground Neutrino Experiment is pulling off one of the most logistically absurd construction projects in American history, lowering 10 million pounds of structural steel nearly a mile underground through a single elevator shaft that’s barely wide enough to fit a compact car.<\/p>\n
That shaft \u2014 just 4.5 feet wide \u2014 is the only path to the workings, meaning every one of the 2,100-plus components had to be engineered from the start to fit inside it, or it simply doesn’t exist as far as this project is concerned.<\/p>\n
This is also the first time CERN has ever invested in scientific infrastructure outside of Europe, which tells you everything about how seriously the physics community is treating what’s being built down there.<\/p>\n
If you’ve never paid attention to neutrino research before, the scale and ambition of what’s happening under a former gold mine in South Dakota this summer might change that.<\/p>\n
Ask The Box \u2192<\/p>\n
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Gold mines don\u2019t usually get a second act. When the ore runs out, the pumps shut down, the shafts flood, and the town next door pivots to selling T-shirts. Homestake, in Lead, South Dakota, ran longer than almost any of them: 125 years of continuous digging, more than 40 million ounces of gold, and workings that eventually reached 8,000 feet below town, the deepest mine in the Western Hemisphere by the time it closed in 2001.<\/p>\n
It was also the operation that made George Hearst rich after he bought the claim in 1877, money that later helped bankroll his son William Randolph\u2019s newspaper empire. The company\u2019s stock sat on the New York Stock Exchange longer than any listing in the exchange\u2019s history.<\/p>\n
So the mine has been a lot of things. What it has never been is a place where steel goes down instead of gold coming up. This summer, crews in Lead are lowering 10 million pounds of structural steel into the old workings, one elevator load at a time, to build the frames for two of the largest cryogenic tanks ever attempted, 4,850 feet below the surface.<\/p>\n
The steel belongs to the Deep Underground Neutrino Experiment<\/a>, or DUNE, hosted by Fermilab in Illinois. Fermilab calls it the largest scientific project supported by the Department of Energy\u2019s Office of Science, and the largest in the United States. The physicists get the caverns in a few years. Right now, the place belongs to ironworkers and hoist operators.<\/p>\n The steel started moving in May<\/p>\n On May 7, Fermilab and the Sanford Underground Research Facility, the lab that now occupies the old mine, held a ceremony in Lead marking the start of the move. Senior Department of Energy officials, members of Congress and CERN leadership all turned up, and everyone got to sign one of the beams before it heads underground for good. Fermilab Director Norbert Holtkamp called the moment \u201cthe start of a pivotal phase for DUNE.\u201d<\/p>\n The steel itself came from CERN, the European lab best known for the Large Hadron Collider, as an in-kind contribution. According to Fermilab, it\u2019s the first time CERN has invested in infrastructure for an experiment outside Europe. The arrangement runs both ways, since American national labs are building superconducting magnets for CERN\u2019s upgraded collider in return.<\/p>\n The full 10 million pounds is scheduled to be underground and prepped for installation over the course of this summer. Which sounds simple enough until you look at the route.<\/p>\n Everything rides one elevator<\/p>\n There are no trucks driving down to the 4,850-foot level. Every piece of DUNE\u2019s support structure travels through the Ross Shaft, one of the mine\u2019s two main shafts, which crews spent years rehabilitating for exactly this job. If a component doesn\u2019t fit in the shaft, it doesn\u2019t exist as far as this project is concerned.<\/p>\n Autonoci\u00f3n Newsletter<\/p>\n No spam. Unsubscribe anytime. Privacy policy (opens in new window)<\/a><\/p>\n Last fall, SURF installed a purpose-built conveyance for the beams: a cage with a floor measuring 4.5 by 5 feet and sides 60 feet high, fitted with an internal hoist that lifts each beam vertical and locks it in place. The beams make the trip standing upright.<\/p>\n In April, crews ran the first full test<\/a>. A 43-foot beam weighing more than 15,890 pounds rolled into the Ross Headframe on rails, got rigged to the winch inside the cage and was lifted into position. The whole operation took about 18 minutes.<\/p>\n SURF says that beam is one of roughly 2,100 structural components making the same trip, and Fermilab\u2019s far detector project manager expects crews to repeat lifts like it hundreds of times. At 18 minutes a lift, you can do the math on how a summer disappears.<\/p>\n The tanks are borrowed from LNG shipping<\/p>\n The structures those beams form will each measure 216 feet long, 62 feet wide and 60 feet high, which Fermilab describes as roughly the size of a five-story building. Inside each one goes a cryostat, a giant thermos built to hold 17,000 tons of liquid argon at about minus 300 degrees Fahrenheit.<\/p>\n Nobody sells tanks like that off a shelf. So CERN contracted GTT, the company that designs containment systems for ships carrying liquefied natural gas, and the DUNE cryostats use the same membrane technology<\/a> that keeps LNG liquid on a tanker crossing an ocean. GTT has been designing smaller cryostats for CERN since 2007.<\/p>\n The design details are where it gets fun. The innermost layer is a corrugated stainless steel membrane, and the corrugations are not decoration. When the tank cools from room temperature down to argon temperature, a drop of roughly 375 degrees Fahrenheit, a smooth liner would shrink by about 20 inches along its length and rip its own welds apart. The corrugations flex instead, and the welds hold.<\/p>\n The inner portions of each cryostat alone require more than 5,000 individual pieces, every one of them sized for the shaft. \u201cIt\u2019s the first time we will do something this big,\u201d said Llu\u00eds Miralles Verge, who leads the cryostat project at CERN. Each finished tank encloses nearly 500,000 cubic feet, about the volume of five Olympic swimming pools.<\/p>\n Then comes the argon itself, a liquid 1.4 times denser than water. Filling the tanks means about five 18-ton tanker deliveries per day at the site, with the argon piped down as gas and recondensed into liquid at the bottom. If hauling delicate cargo at brutal temperatures sounds like a familiar genre, it\u2019s the same obsession that got Europe\u2019s Antarctic ice cores across the equator at minus 58 degrees<\/a> without thawing a single air bubble.<\/p>\n Steel shipment<\/p>\n 10M lbs<\/p>\n CERN\u2019s in-kind contribution, moving underground through summer 2026 via the Ross Shaft.<\/p>\n Each module<\/p>\n 216 x 62 x 60 ft<\/p>\n Two structures, each about the size of a five-story building, assembled 4,850 feet down.<\/p>\n Liquid argon<\/p>\n 17,000 tons<\/p>\n Per tank, held at about minus 300 degrees Fahrenheit inside LNG-style membrane cryostats.<\/p>\n TARGET<\/p>\n First beam<\/p>\n 2031<\/p>\n Fermilab\u2019s stated priority for the first neutrinos fired 800 miles from Illinois.<\/p>\n This mine has caught neutrinos before<\/p>\n The reason for all the depth is straightforward. Neutrinos barely interact with anything, which is why physicists call them ghost particles. Cosmic rays hammer the surface constantly and would bury the faint signals the experiment is after. A mile of Black Hills rock filters out the noise.<\/p>\n Homestake learned that lesson before almost anyone. In 1965, a Brookhaven chemist named Ray Davis talked the mining company into excavating a cavern on the same 4,850-foot level, then installed a 100,000-gallon tank of perchloroethylene<\/a>, ordinary dry-cleaning fluid, to catch neutrinos streaming out of the sun.<\/p>\n Davis found them, but only about a third as many as theory predicted. That mismatch, known as the solar neutrino problem, hung over physics for decades until it turned out the neutrinos were changing type mid-flight. Davis had been right all along, and in 2002 he shared the Nobel Prize in Physics for it.<\/p>\n The mine shut down around that same era, the National Science Foundation picked it as the site for a national underground lab in 2007, and between 2021 and 2024 crews blasted out 800,000 tons of rock to carve two seven-story caverns plus a third for utilities. America has a habit of keeping its most interesting machines out of sight. The country\u2019s only fully digital nuclear reactor runs in a basement at Purdue<\/a>.<\/p>\n A prototype in Europe is holding 300,000 volts right now<\/p>\n There\u2019s a reason nobody is improvising any of this. Once the detectors are assembled inside the cryostats, filled with argon and sealed, Fermilab says scientists won\u2019t have access to the submerged components for decades. Whatever goes in has to work on the first try, unattended, for a very long time.<\/p>\n