How do you landscape the garden of a house that is sat on an old army camp? If you're Dave Billings, you don't plant flowerbeds - you bury a Boeing 737.
The 44-year-old from Derbyshire has already transformed his lawn into something from a Cold War thriller, creating an underground bunker accessed via the steps of an old wartime well.
But that, it seems, was only the beginning.
Now he's setting about expanding his underground network - which already connects to his house - by adding a full-sized Boeing 737 to the labyrinth.
Dave purchased the plane for £4,000 after spotting an advert for it on Facebook Marketplace.
What followed was a complicated operation to transport the plane from the field where it had been left, loading it onto a lorry with the help of friends before driving it back to his yard.
Then came the real transformation.
He has already cut off the back section and plans to bury the aircraft 14 feet underground, linking it to his existing bunker system.
One of the entrances will be through the original plane door, so visitors will step inside as if boarding a flight - only to descend into a hidden underground complex.
Inside, David is determined to keep the Boeing working like it used to.
'I want the aircraft toilet to work as it does on a plane,' he tells the Daily Mail. 'People think it only works because of altitude, but it actually uses a vacuum pump at ground level - so I'm going to make that function properly and have the toilet working as it should.
'I just think that'll be a great feature.'
He also plans to install ovens fitted into the original galley-style shelving compartments and retain authentic trim in the rear section around the toilet and kitchen area, so part of the interior still feels unmistakably like a passenger jet.
But move past that section and the aesthetic changes dramatically.
Dave has stripped out the insulation to expose the aircraft's ribs and internal structure, which he intends to paint military-style light green.
Once buried, insulation will wrap around the exterior of the fuselage, allowing the industrial framework to remain exposed inside.
He's even added ovens that fit in the shelving compartments along the wall that he hopes to get working.
Dave has stripped out the insulation to reveal the plane structure inside and plans to leave some exposed and painted military-style light green.
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'Once you come past the toilet, it's going to look more like a military plane, with all the ribs showing so it looks quite industrial,' he says.
'The look is brilliant because I'm insulating around the outside when it's buried, so it won't need internal insulation.'
Even the entrance is being designed for maximum impact.
Dave hopes to install an airport-style corridor tunnel sealed to the side of the plane, so it feels as though guests are walking through a boarding bridge before seeing the aircraft door ahead of them.
At the opposite end, he plans to add a lift - both to make the bunker accessible for anyone who struggles with stairs and to transport supplies underground.
Although the project is primarily for fun, Dave says he is also building it to function in a genuine emergency.
With thick enough concrete, he believes the bunker could withstand fallout within a 10-mile radius of a blast, providing a place to shelter until radiation levels drop.
He plans to fit bunks, storage, a working kitchen and essential facilities to make it viable for several days underground - though emergency power is one key element still to be finalised.
'That's one of the things I've got to sort out for the project, but it has actually got a lot of the essential things,' he adds.
Aside from the interior design and crafty features, Dave does hope the bunker will work effectively in an emergency.
The entire project is being funded through revenue from his social media channels - Tornado Dave on YouTube and @tornado__dave on TikTok - with Dave reinvesting what he earns back into the build.
While he initially estimated it might cost around £15,000, he admits it will likely come in closer to £25,000 by the time it's finished, particularly as growing support allows him to upgrade elements along the way.
By trade, Dave works in fabrication, tackling complex engineering projects as hobbies in his spare time.
He hopes to complete the buried Boeing by the end of the year.
As for his family, his wife is 'very understanding', he says - provided he finishes a few other jobs first.
Ultimately, though, the project is for his son.
'He's loving it,' Dave says. 'It's the best adventure ever for him.'