Co Derry’s Paul McErlean had been hiking for nine hours with two friends when he received a text saying he had tested positive for the virus.
Unable to stay at their planned campsite, the three men took to social media in a desperate attempt for help.
With both light and hope fading, they were soon inundated with replies – one from a former UK home secretary.
The story of how Mr McErlean, Charlie Coward and Andreas Maltan went from being stuck in the Welsh wilderness to finding “isolation accommodation” was first reported in the County Derry Post.
Speaking to BBC News NI, Mr McErlean, from Lavey, said he started to feel a “bit sore” in his arms and neck while on the ferry to Liverpool.
“I didn’t think it was Covid but I was just a bit worried about being in a tent for that long and feeling like that in Snowdonia,” he said.
The 23-year-old erred on the side of caution and took a test at the earliest opportunity, which turned out to be in Wolverhampton, en route to Wales.
“The symptoms were gone at this stage but I had already committed to getting the test,” he said.
He had almost completely forgotten about it until they were nearing the end of a 30km (18 mile) hike on 23 July and he received his results.
“We were all absolutely knackered. We had hardly any water left, batteries on our phone were dying and we were pretty much in the middle of nowhere,” he said.
“I called the campsite and explained what happened so we couldn’t go there.
“There was no room at any B&Bs in the town [Dolgellau] and the closest hotel was not taking Covid-positive travellers for isolation.“I mean it wasn’t just for the night, we needed to find somewhere that was for basically two weeks.”
After calls to the NHS helpline and parents, the friends decided to put out a plea on Twitter.
“ADVICE NEEDED,” Mr McErlean’s tweet began on July 23 at 20:00.
“Me and 2 lads are hiking in Wales, just got a positive Covid test 20 mins ago.
“Can’t stay at the planned campsite tonight, have nowhere to isolate and already know every B&B etc. is booked up.
“No accommodation, no transport and just finished a near 30km hike. What do we do?”
Replies from people offering accommodation came, as did advice on what to do next.
“Lisa McGee, who writes Derry Girls, retweeted it and we got an offer from former British Home Secretary Jacqui Smith who had a spare caravan,” Mr McErlean said.
“But it wasn’t all former British home secretaries and people like that, it was mostly ordinary people back home and in the area just offering to help us out – it was really nice.”
It was a work colleague of Mr McErlean’s father who came to the rescue in a minivan and let them stay in a vacant property in Cheshire, where they remained until August 2.
When asked how the three spent their time, he replied: “A lot of monopoly”.
“No-one lives in the house so there’s no wifi,” he said.
“We treated ourselves to some Olympic events on our phone data, but we had to pick and choose which ones very wisely.”
Mr McErlean, who is heading back to Northern Ireland, said the experience had been a “wake-up call”.
“It’s definitely made me think twice about Covid,” he said.
“I was due in for my second jab but that’s obviously delayed now with my positive test.
“We got lucky – my symptoms were mild. Many young people haven’t got two [vaccine] doses yet and many may not have money if they were to get stuck like us.
“I don’t think I’ll be going anywhere too soon but I’ll definitely be getting a Covid test if I do,” he added.
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