Now, a team of volunteers is working to reopen the 4,843 square-foot site to the public.

The work, led by community group Mundesley Action 4 Cardiac Hill, began last month.

Trustee, Denise Revell, said: “The long-term plan is to open it up to the public and perhaps convert it into some sort of museum.”

It took days to break through the concrete (Image: Mundesley Action 4 Cardiac Hill and Coastal Gun Battery)

The group had to hire a digger to break through the entrance (Image: Mundesley Action 4 Cardiac Hill and Coastal Gun Battery)Built to defend Britain’s coastline from possible invasion, gun batteries were equipped with heavy artillery to target enemy ships and........

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