One of the big detectors which record these collisions, they didn't think there was technology that could withstand the radiation that would be created in the LHC, so there was basically a lump of lead in the middle of this object with some detectors around the outside, but subsequently we have developed technology.
Uno de los grandes detectores que registran estas colisiones, no había la tecnología que pudiera soportar la radiación que se crearía en el LHC, por lo que era solo un trozo de plomo en el medio con algunos detectores alrededor, pero después hemos desarrollado la tecnología.