Talk:Large Hadron Collider/Comments

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The collider is contained in a 27 kilometre (17 mi) circumference tunnel located underground at a depth ranging from 50 to 150 metres.[1] The tunnel was formerly used to house the LEP, an electron-positron collider.

The three metre diameter, concrete-lined tunnel ...

Is the tunnel 27km in circumference or 3m in diameter? There's quite a difference between these two dimensions.