The world’s largest and most powerful particle collider is shutting down for two years.

All experiments by the Large Hadron Collider (LHC) are on hold while the complex receives “major improvements and upgrading.”

Operators on Monday turned off the machine, ending its “very successful” second run—during which the LHC collected “an enormous amount” of data, more than 300 million gigabytes of which is now permanently archived by CERN (the European Organization for Nuclear Research).

In layman’s terms, that’s about 1,000 years of 24/7 video streaming.

“The second run of the LHC has been impressive, as we could deliver well beyond our objectives and expectations, producing five times more data than during the first run,” according to Frédérick Bordry, CERN director for accelerators and technology. “With this second long shutdown starting now, we will prepare the machine for even more collisions” at a higher energy level.

During the two-year break, known as Long Shutdown 2 (LS2), the accelerator complex and detectors will be reinforced and upgraded in preparation for its next run in 2021, as well as the High-Luminosity LHC (HL-LHC) project, which will begin after 2025.

This isn’t a vacation for CERN scientists, though.

While the Large Hadron Collider gets spruced up, physicists will comb through data from its second run, looking for “very rare processes,” Eckhard Elsen, director for research and computing, said in a statement.

“They will be busy throughout the shutdown examining the huge data sample for possible signatures of new physics that haven’t had the chance to emerge,” he explained. “This will guide us into the HL-LHC when the data sample will increase by yet another order of magnitude.”

It took CERN—in collaboration with more than 10,000 scientists from 100-plus countries—10 years to build the largest machine in the world. The LHC lies some 574 feet beneath the France-Switzerland border near Geneva, where scientists test predictions of particle physics theories.

Following its first data-taking period from 2010 to 2013, the accelerator was taken offline and upgraded over two years, restarting again in early 2015 for a second research run.

“In addition to many other beautiful results, over the past few years the LHC experiments have made tremendous progress in the understanding of the properties of the Higgs boson,” CERN Director-General Fabiola Gianotti said in a statement.

Named after physicist Peter Higgs (one of the scientists who proposed the mechanism), the Higgs boson was discovered at CERN in 2012. It has been studied ever since, analyzed for the way it decays or transforms into other particles.

“The Higgs boson is a special particle, very different from the other elementary particles observed so far,” Gianotti added. “Its properties may give us useful indications about physics beyond the Standard Model.”

Other LHC experiments have produced a wide range of results and hundreds of scientific publications, including the discovery of exotic new particles.

Proton beams will resume in spring 2021, with the LHC’s third run.

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