Wow... misinformation amuck.

A. When a particle collider is shut down, it takes a good long while for the particles within to slow down.

B. Just because a service hatch has been opened, does not mean everything inside of it has stopped (at least the colliders built long ago).

C. Soviet Researchers were hardly known for safety protocols and safe-guards of solid functionality.

D. Soviet Researchers were (are?) kindof known for doing things that weren't so bright (often due to Vodka or wagers).