British teen Jay Slater, from Oswaldtwistle in Lancashire, has been missing in Tenerife since Monday.
The 19-year-old apprentice bricklayer travelled to the Canary Islands last week for the 'New Rave Generation' (NRG) music festival with pal Lucy Mae and another friend.
However things started to go wrong on Sunday night, when Jay chose to stay out with people they met that day instead of go back to the accommodation with his friends.
By Monday morning Jay had called Lucy in a panic to say he had attempted to hike back having missed the bus, but was now lost and in desperate need of water.
He has not been heard from since.
Below is a full timeline of his known movements since Sunday.
Jay is seen in this image shared to his friend Lucy's social media days before he disappeared
June 16 (Sunday evening):
Jay left the rave in South Tenerife with a group of people he met that day, telling Lucy he was staying with them at their apartment in an undisclosed location. One of the group has a hire car.
8.35pm:
Jay is seen in the final Snapchat clip before his disappearance, wearing a grey t-shirt with a green stripe.
June 17, 8.15am:
Lucy said she received a panicked call from Jay in which he said his phone battery was only on one per cent, he was lost - and in desperate need of water.
He continued that he had missed the bus back and was attempting to walk back using a maps app on his phone.
His phone location showed he was in a mountainous area of a national park some 10 hours' walk away from his accommodation.
Jay is seen in the final Snapchat clip before his disappearance, wearing a grey t-shirt with a green stripe
Lucy Mae said of Jay: 'He's ended up out in the middle of nowhere. Jay was obviously thinking he would be able to get home from there... then in the morning he's set off walking, using his Maps on his phone and ended up in the middle of mountains with nothing around'
8.50am:
Jay's phone dies. Its last known location is believed to be somewhere in the Rural de Teno national park.
Close to the PR-TF51 hiking trail above the small village of Masca.
9.04am:
Police in Tenerife are alerted, and Lucy also gets in touch with the British Embassy.
June 18, 2.30am:
Jay's mother Debbie Duncan and step-dad Andy Watson, 63, are alerted to his disappearance when police officers knock on their door in the early hours of the morning.
The officers advised that the best thing they could do was to get 'yourself out there'.
Jay is pictured right alongside mother Debbie and brother Zak who flew out to Tenerife amid rescue efforts
Jay's friend Lucy reported Jay missing to police and launched search efforts yesterday morning
11.35am:
Ms Duncan and Jay's brother Zak land in Tenerife after catching the first flight out of Manchester airport.
1.45pm
Specialist mountain rescue teams and helicopters are deployed in the search to find missing Jay.
2.30pm
Ms Duncan posts an appeal on Facebook updating that her son is still missing and pleading with other to come forward if they know any further information.
Tuesday evening
The search is currently focused on the Masca hamlet, in the municipality of Buenavista del Norte.
A Civil Guard spokesperson said that mountain rescue teams and helicopters have been deployed in the search to find missing Jay.
A local resident, living in Tenerife, has printed out missing posters to put up around Adeje.