 The first large experiments at LNGS ran in 1989; the facilities were later expanded, and it is now the largest underground laboratory in the world.There are three main barrel vaulted experimental halls, each approximately 20 m wide, 18 m tall, and 100 m long.These provide roughly 3×20×100= of floor space and 3×20×(8+10×"π"/4)×100= of volume.