JAY Slater could still be alive in another part of Tenerife, investigators probing the Brit's disappearance believe.
Spanish police are now set to pursue at least three bombshell leads after a source in Tenerife told The Sun the case is "very much open" with "all scenarios being kept in mind".
Cops announced on Tuesday there are still "several lines of inquiry" active in the hunt to find the missing teen.
As The Sun revealed investigators haven't deemed the teen as "missing feared dead" yet.
One of the trio of potential leads revolves around a theory suggesting Jay could be in a different part of Tenerife - far away from where rescuers and his family have been searching.
The 19-year-old has been missing for over three weeks after he vanished while on holiday in Tenerife with his two pals Lucy Mae Law and Brad Hargreaves.
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The apprentice bricklayer from Lancashire headed back to an Airbnb hours away from his holiday apartment after a night of partying on June 16 with two "new friends".
He was reported missing by pal Lucy hours after he left the rented home in Masca as he embarked on a treacherous 11-hour trek through rough and rocky terrain.
One line of inquiry is a theory that Jay might even be in a different part of Tenerife and still alive. All scenarios are being kept in mind
Source in Tenerife
The Spanish Guardia Civil deployed a mammoth search party in hopes of finding Jay as his family and friends all flew out to look for him.
Efforts have centred around Rural de Teno park - a mountainous region near to where his phone's location pinged for the final time.
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As well as the town of Santiago del Teide when apparent CCTV footage caught Jay wandering across the road.
A source told The Sun: “Even though the ground search for Jay is over, the investigation into where he might be still remains very much open.
"One line of inquiry is a theory that Jay might even be in a different part of Tenerife and still alive. All scenarios are being kept in mind.
"The case is very much open because there are still a number of unanswered questions which officers must find answers to.
"They are convinced someone, somewhere knows what happened to Jay or knows where is now is, and that’s what they are working towards trying to establish as quickly as they can.”
After cops found no trace of Jay, the official search was called off on June 30 after two weeks.
His heartbroken and frustrated family vowed to carry on the hunt regardless as they scoured the mountains themselves.
A new team led by local hiker Juan Garcia, and including Jay's uncle Glen Duncan, dad Warren and brother Zak, focused on an area of a gorge close before exploring caves, ravines and slopes.
Seasoned mountain experts who were flown out by Jay's family said the search was hampered by the altitude, heat and the size of the area.
Warren voiced similar concerns over the huge area they needed to look through.
It’s just a riddle and I don’t know the outcome. We’re going round and round in circle
Warren Slater
He warned it would've taken "an army 10 years" to search the whole area as the distraught father pleaded with Interpol and British cops to help.
This week, The Sun revealed British police still cannot get involved despite Warren's emotional pleas.
The desperate dad has remained hopeful that they will find Jay but has been vocal about the family's anguish over the case.
"It’s just a riddle and I don’t know the outcome," Warren added.
"We’re going round and round in circles."
It comes as Jay's best pals Lucy and Brad have reportedly flown home to the UK.
A family source said: "It's heartbreaking for the friends to have to fly home without Jay.
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"But there's only so long they can remain in Tenerife. They are flying home with mixed emotions.
"Part of them hopes to never see Tenerife again but, on the other hand, there dream is to return if Jay is found and be there to greet him and give him a hug."
The mysterious case of Jay Slater
By Ellie Doughty, Foreign News Reporter
Monday July 8 marked three weeks since Jay Slater, a 19-year-old from Oswaldtwistle, Lancashire, vanished in Tenerife.
The apprentice bricklayer, who flew out to the popular holiday island for a rave festival with friends Lucy Law and Brad Page, has made headlines around the country.
On Sunday June 16 the three of them headed off to one of the events at Papagayo nightclub.
In the early hours of Monday 17 - Lucy and Brad were ready to head back to their hotel, but Jay wanted to keep partying.
It was then that he left the south of the island and headed to an Airbnb in the northwest with two British men.
The Sun revealed the identity of one of them - convicted drug dealer Ayub Qassim, who spent nine years behind bars in the UK.
For days it was thought that the second mystery man went by the name ‘Johnny Vegas’.
On Sunday former detective Mark Williams-Thomas, who is out in Tenerife investigating, said Qassim told him he is in fact the man behind the nickname ‘Johnny Vegas’.
We don’t yet know the identity of the second man - who remains a key part of the puzzle in Jay’s mysterious disappearance.
Qassim claims he drove Jay and the friend back to their accommodation and said they all went to sleep.
In the morning he offered to drive the teen back to the Los Cristianos resort after a nap, but Jay, hungry and tired, said he wanted to leave immediately.
Lucy, the last person to speak to Jay, claims she had a panicked call from him soon after he left the holiday let, telling her he was lost and thirsty, his phone was about to die and that he’d been cut by a cactus.
Jay had been seen by the owner of the Airbnb that morning wandering around near the Rural de Teno park - a mountainous region close-by.
He is believed to have been attempting the 11-hour trek back to his hotel, despite the alleged offer of a lift and more buses scheduled for the day.
It was there that his phone last pinged - and he hasn’t been seen or heard from since.
Mark Williams-Thomas has claimed he left the Airbnb quickly, and was “scared”.
Bizarrely, Qassim says he was woken up that morning by a phone call from an unnamed friend of Jay, saying he was “in a ditch” somewhere and had been “cut by a cactus”.
Jay’s friend Lucy claimed to have “tracked down” the two men in the Airbnb after he vanished - quizzing them on the morning of Jay’s disappearance.
Some reports have suggested Lucy knew the two men, although it is not clear how.
She has dubbed his disappearance “weird and suspicious”.
Both men were questioned by Spanish cops on June 17 but quickly deemed “irrelevant” to the investigation and cleared to fly back to the UK.
Police spent almost two weeks searching for Jay in the Tenerife mountains, scouring a 2,000ft ravine, before calling it off on Sunday June 30.
Jay’s family have repeatedly slammed the Spanish investigation into his bizarre disappearance.
His uncle, Glen Duncan, is convinced of “third party involvement”.
And the teen’s devastated dad, Warren Slater, says “everything stinks”
He told The Sun: "My starting position, I’ve said this from day one, ask the two men who’ve taken him - and then start from there."
A number of unanswered questions remain, over why Jay would have travelled so far with two older men he didn’t know, why said men would have taken him in, and why he braved the Tenerife mountains with no phone battery, water or heat protection for a day-long walk