They were called to Oakhurst Lane in Loxwood shortly after 12.30pm today (Thursday, July 14) after reports that the man had fallen into a large construction trench.
Billingshurst firefighters were first on the scene.
They have now been joined by the rescue tender from Crawley and a crew from the West Sussex Fire and Rescue Service technical rescue team.
The man is reported to have suffered a head injury.
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