Nigel Kirkwood worked in the mining industry for 25 years and it was his fascination with the natural sustainability of tunnels that led him to build his own underground, earth-sheltered home to live out his retirement years. Located in Quindalup, Western Australia, Kirkwood’s self-built hobbit house is buried under nearly 1,000 tons of soil and covered with greenery.

Working in the mining industry taught Kirkwood a thing or two about the sustainable features of underground structures. Using the tunnel layout as inspiration, he built the home on two large concrete footings and covered the structure with 19 tons of high-quality steel. He then sealed the structure with a Polyurea water- and fire-proof coating and, as the final step, buried his new home under 1,000 tons of locally-sourced loam sand.

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Along with the protection against fires and storms that underground homes offer, the earth-sheltered structure has natural insulative properties, requiring require no heating or cooling. Additionally, the interior is virtually sound-proofed against outdoor noise.

Related: This cute little hobbit home cost just $100 to build

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The interior of the home is surprisingly bright and airy, thanks to the all-glass entranceways on either side of the home. The rooftop is covered in natural plants and beautiful flowers that bloom in the summertime. The greenery is drip irrigated and fertilized throughout the year.

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Mr. Kirkwood will be opening his house to the public in September for Sustainable House Day in order to inspire others to consider sustainable building options.

Via Homecrux

Images by ABC South West: Roxanne Taylor, via Homecrux