The man was part of the team building ‘porous portals’ on the tunnel entrance where the Align JV of Bouygues Travaux Publics, Sir Robert McAlpine, and VolkerFitzpatrick is main contractor.
A site email seen by the Enquirer said: “It is with great sadness, we announce that a colleague working as part of the Porous Portal team suffered a suspected cardiac arrest whilst working in the tunnelling office earlier today.
“Despite the best efforts of colleagues, the on-site medical team and the emergency services, he passed away. His next of kin have been informed.
“Further details will be communicated in due course, however our immediate thoughts are with his friends and family.”