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Workers in Protvino are completing an underground tunnel for a Russian hadron collider. In Soviet times, it was to house sophisticated equipment. Now urban spelunkers are having a field day.

CERN chief confirms re-launch of particle collider in November
Particle collider repair bill hits $37.7 million
Collider launch postponed over reliability raising work -scientist
Helium leak shuts Large Hadron Collider for two months
The Large Hadron Collider repaired. Religion continues to question its purpose.
Large Hadron Collider: Scary?
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TEHRAN, February 11(RIA Novosti correspondent Marc Bennetts)
MOSCOW, February 11 (RIA Novosti)
KRASNAYA POLYANA, Russia, February 11 (RIA Novosti)