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Tunnellers who allegedly contracted a crippling bone disease while working on the second Dartford Tunnel project during the 1970s have secured compensation payouts from contractor Balfour Beatty.A number of the workers secured out of court settlements this week.Balfour Beatty will not release the compensation figures because other claims are currently being considered by the firm's legal advisers.A spokeswoman said: 'There have been some claims arising out of the second Dartford Tunnel contract.'Some have been withdrawn and others settled out of court with no admission of liability by the insurers.'Bone necrosis is caused by nitrogen getting into the bloodstream and damaging joints. It occurs in tunnelling projects where work is carried out in compressed air. CONSTRUCTION NEWS