America cancelled the world's most powerful particle collider, leaving a 22.5-km tunnel hidden beneath Texas for more than 30 years

• Designed to become the world's most powerful particle accelerator, the collider was expected to transform the study of fundamental physics by smashing protons together at unprecedented energies.
• The project was first proposed in 1983, and construction broke ground in 1991, according to accounts of the SSC's history refe