The owners of Stump Cross Caverns are taking on a mammoth 105-hour stay underground to raise money.
Lisa Bowerman and Nicholas Markham, who own the limestone caves near Pateley Bridge, are staying in one of the caverns as part of a crowdfunding campaign for new cave lighting.
Speaking to the Stray Ferret, Ms Bowerman said the move was inspired by Geoff Workman, who in 1963 spent 105 days in one of the caverns and broke the previous world record for time spent continuously underground by 40 days.
The pair have set a crowdfunding target of £200,000 and will remain in the cave until 8pm on Friday.
Ms Bowerman told the Stray Ferret:
“We decided that we needed to do something crazy. It’s a massive undertaking and we need this crowdfunder to work.
“I said to Nick that if we do nothing then we will get nothing.”
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The couple, who are dressed as a caveman and cavewoman, are live streaming their stay in the cavern every day on their Facebook page.
As part of the fundraising campaign, the pair have also decided to raffle off their £130,000 flat in Pateley Bridge.
They hope to sell 20,000 tickets for £10 each to generate funds to maintain the ancient limestone caves.
In March, the couple raffled their VW Campervan, which raised £72,5000 in 40 days — enough money to keep the caverns open.
You can find out more on how to support the Stump Cross Caverns campaign here.