PHOTO: ROBERT KITCHIN/STUFF Real estate agent Stephen Lee pictured in the caves which were begun by 11 year-old Derek Aston, who used a kango hammer to carve out the rock.

The only way to believe what Derek Aston and a kango hammer built in Eastbourne, is to see it.

A Lower Hutt property on the market for the first time in 60 years, features a large man-made cave network.

The hidden entrance opens up to a 10-metre tunnel leading to a cave and a spiral staircase that descends to a second tunnel.