A renewed search for missing teenager Jay Slater is under way in Tenerife after Spanish police appealed for expert volunteers to help.
The 19-year-old, from Oswaldtwistle, Lancashire, disappeared following an attempt to walk back to his accommodation on June 17.
On Friday, the Guardia Civil appealed for volunteer associations, such as firefighters, and individual volunteers who were experts in rugged terrain to assist in a “busqueda masiva”, or massive search, on Saturday.
The search in the village of Masca, near to his last-known location, is being co-ordinated to take in a steep rocky area, including ravines, trails and paths.
Brigadier Cipriano Martin, chief of the Guardia Civil’s mountain rescue team, said Mr Slater would not have travelled to “any area we don’t go to”.
Speaking through a translator, he told the BBC: “There are difficult areas and we’ve given instructions for people not to risk their own safety.
“But there’s something we need to make clear, which is any area we don’t go to, well, Jay won’t have gone there either.
“You have to think about it logically – if I see there’s vegetation in front of me and I’m going to get spiked, and I can’t get through, then he won’t have gone through that area either.
“We have to be logical, obviously.”
“But you can reach the beach along them, so I reached the beach.
“We didn’t find anything. It’s a path that goes above and not along the bottom of the cliff, it has drops, and what’s needed are ropes to get down and we also know he was not equipped for that.
“There are rocky drops that you cannot get beyond, you can only get down with a harness and ropes – the people searching that spot today will have to turn around I think, because they don’t have the necessary equipment, and anyway the best that Jay could do was simply to walk.”
Mr Slater attended the NRG music festival on the island with two friends before his disappearance and his last known location was the Rural de Teno Park in the north of the island – which was about an 11-hour walk from his accommodation.
He had reportedly been driven to an Airbnb property in Masca.
According to reports, media were told in a press conference on Saturday that two men who were reported to have rented the Airbnb are “not relevant” to the case.
He said: “He was on the phone walking down a road and he’d gone over a little bit – not a big drop – but a tiny little drop and he was going down, and he said ‘I’ll ring ya back, I’ll ring ya back’ because I think someone else was ringing him.”
He confirmed he could see his friend’s feet “sliding” down the hill and could hear he was walking on gravel.
But, Mr Hargreaves said he and his friend were both laughing at that point.
He added: “He didn’t seem concerned on the phone until we knew how far away he was.”
He told the programme he still had hope for Mr Slater and was “praying” for him to come home.
Earlier this week, his mother Debbie Duncan, who travelled to the island following his disappearance, said money raised online would be used to support mountain rescue teams, and to cover her own accommodation and food costs.
Donations flooded in after GoFundMe appeal “Get Jay Slater home” was set up by Lucy Law, his friend and the last person to speak to him, and by Friday more than £40,000 had been raised.
“I wanted to share that these funds will be used to support the mountain rescue teams who are tirelessly searching for Jay.
“Additionally, since our stay in Tenerife needs to be extended, we will also use the funds to cover accommodation and food expenses.”
Ms Law said Mr Slater told her in a frantic phone call before he went missing that he was “lost in the mountains, he wasn’t aware of his surroundings, he desperately needed a drink and his phone was on 1%”.
Search teams, co-ordinated by the Guardia Civil, have since mounted a huge manhunt using helicopters, drones and search dogs to scour mountainous areas of the island, but are yet to find the teenager.
Ms Duncan has described her son’s disappearance and the wait for news as a “living nightmare”.