Work to build an “underground cavern” in a back garden in Sefton has been going on for five years despite not having planning permission.

Now an application for retrospective permission for the cavern has been made by an Ainsdale resident, who is creating the garden structure complete with an access staircase and a water feature.

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A drawing submitted as part of the application, shows close to the archway a series of steps leading down to a passageway that in turn leads into the underground cavern, which sits just beyond the pond.