A man who says he chucked out a hard drive containing £150million of Bitcoin has told how he wants to use robot "dogs" to recover it.
James Howells, 37, claims he accidentally tossed his 8,000 bitcoins into landfill after mixing up two identical hard drives at his home.
He bought the currency in 2009 when it was almost worthless - but the value has since soared, before dropping slightly. In November, the value stood at £459m.
Now he wants to spend £11m to hire a firm previously used by NASA boffins and use robot dogs to retrieve the fortune.
James told the Times: "This is the most professional operation we've put together.
"It's a serious proposal, we are capable of completing this task to a very high standard."
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The Artificial Intelligence firm Ontrack's "dogs" were previously used to recover a hard drive from the 2003 Columbia space shuttle disaster.
Experts at the firm believe up 90 per cent of the Bitcoin fortune can be recovered.
If the stun worked, James says he will transform the landfill site in Newport, Gwent, into a solar farm with wind turbines.
But Newport City Council said his latest proposal "pose significant ecological risk which we cannot accept, and are prevented from considering by the terms of our permit".
The council originally refused his bid to search the site in 2013 - and have consistently maintained that position since. They've also highlighted that there is 'no guarantee' the hard drive is at the landfill site, and don't want to close the site for local residents.
James has now secured £10m in private funding and the support of Newport's former landfill site manager in his latest bid to retrieve the fortune.
Whether the hard drive is found or not, he promises the group "will leave [the site] in a better condition than when we arrived".
Howells refutes this, as he complained to the Telegraph: "They haven't gone to the experts to find that out. They've gone to their local IT manager ... where's his PhD? The guys I've gone to have PhDs."
Howells says if he does find the hard drive, he will keep a third of the millions for himself, splitting the rest among excavation teams and investors, as well as locals, to whom he'll give £50 in bitcoin apiece.
