From Science, July 21, 2017: To build the modular detector, workers have to carve out massive caverns 1,480 meters underground, haul out stone that weighs as much as a dozen aircraft carries, and truck in millions of liters of frigid liquid argon. On July 21, officials gathered deep underground to turn the first few shovels of stone.

The construction of ProtoDUNE at CERN continues, and as you can see, it’s got a shiny, metallic interior.

Fermilab employees and users will be able to participate in the groundbreaking ceremony in Ramsey Auditorium via live video. An ice cream celebration will follow in the atrium.