The IceCube Neutrino Observatory is a neutrino detector constructed at the Amundsen–Scott South Pole Station in Antarctica. Similar to its predecessor, the Antarctic Muon And Neutrino Detector Array, IceCube consists of spherical optical sensors called Digital Optical Modules, each with a photomultiplier tube, located under the Antarctic ice and distributed over a cubic kilometre. The project is a recognized CERN experiment and construction was completed in 2010. This photograph shows the exterior of the IceCube building in 2023.Photograph credit: Christopher Michel