JAY Slater's best friend said he could hear the missing teen slipping on rocks during a final video call.
The 19-year-old phoned his pal Brad - who he was on holiday with in Tenerife - after getting lost last Monday morning.
Jay, Brad and friend Lucy Mae jetted to the island earlier this month to enjoy the three-day NRG festival.
After going to a rave that finished in the early hours of June 17, apprentice bricklayer Jay headed to Masca with two British men he had met that night.
He shared a final Snapchat from their Airbnb of a hand holding a cigarette at 7.30am.
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Jay then tried to make his way back to his holiday accommodation - an 11-hour walk away.
But at around 8.50am he made a desperate call to his friend Lucy saying he was lost in the "middle of nowhere" and had just one per cent battery on his phone.
Jay also said he had cut his leg on a cactus and needed water.
It is unclear whether the call to Brad was separate to the one made to Lucy.
Now Jay's friend Brad has opened up their last conversation - saying Jay wasn't initially concerned about walking back to their accommodation.
He told Isla Traquair on ITV's This Morning he could hear Jay's feet slide on the rocks - signalling to him he'd gone off the road.
Brad said: "That's how I knew he went off the road because, you know when you walk on gravel, or whatever it is, you can... you know what I mean, stones."
He admitted, however, he wasn't worried at that point as Jay reassured him he was fine - but he did tell his friend to put his location on.
Brad added: "We were both, like, laughing about it. He said: 'look where I am'."
He said Jay then cut off as he had another call waiting - but promised to phone back.
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Both Brad and his mum Rachel Hargreaves have vowed to stay in Tenerife for "as long as it takes" to support Jay's distraught family.
Cops on the island are now planning a large-scale search for Jay tomorrow and have pleaded for volunteers to take part - despite rejecting help from British police.
It comes as...
- Deluge of tip-offs flooding in for Jay appeal
- Search for Jay hones in on series of caves
- GoFundMe page for his family hits £40,000
- Crews fear he won't be found alive if he vanished in mountains
- Tenerife worst place to go missing, expert warned before Jay went missing
- Ex-top cop who tracked down Raoul Moat reveals search theory
- Jay was attacked by gang when he was just 12
- New pics of Jay emerge at a pool party two days before he vanished
- Cops quiz locals who 'saw Jay watching Euros'
- Investigator reveals descriptions of two men who partied with teen
- Crews scour exact spot where mystery 'grainy figure' was seen
Authorities on the island last week insisted they had the resources they needed for the hunt.
Officials say the huge sweeping search will take place tomorrow in Masca from 9am.
Police confirmed they are not looking for "general" unexperienced members of the public to join the search.
Instead, they are requesting the help of those who are experts in dealing with rocky terrain as well as professional volunteers such as firefighters.
Their cry for help comes despite them turning down help from their British counterparts as they insisted they had all the resources required.
Police in Tenerife said today: "The Guardia Civil prepares and coordinates a large search to find the young British man missing in the village of Masca.
"The collaboration of all those Volunteer Associations is requested: Civil Protection, Firefighters, etc., and even private volunteers who are experts in the abrupt search terrain.
"The massive search will be carried out on Saturday, 29 June from 9am."
Jay's distraught mum Debbie Duncan last week slammed police on the island for not letting cops from Lancashire Police fly out to help search for her son.
She said: "I know the Spanish police mean well, but the problem we are having is the language barrier, we just don't seem to be getting told. I'm sure they are doing their best.
"They told me they had used dogs and drones and then they said Lancashire police had offered their resources but they turned it down, but I think that would have really helped.
"I would feel happier if our people were over helping. It's just so difficult not knowing where he is, the area and the terrain is rough, but the police were saying that now there are too many people up there and it could interfere with their investigation."
On Tuesday, cops on the island were forced to draft in reinforcements with specialist sniffer dog teams.
Rescue crews have been focussing much of their search on a 2,000ft ravine in the desolate Rural de Teno park.
They have now shifted their focus to caves near Los Carrizales - around an hour and a half on foot from the Airbnb Jay went to with two men.
Los Carrizales is a small hamlet not far from Masca in the Teno mountains.
But police sources have warned that it is "very unlikely Jay has survived if he got lost in the mountains".
Yet authorities have said there are no plans to put a stop to the search yet, despite no signs of Jay.
