Shocking images and clips show how 1,000 revellers descended into the countryside for an illegal rave that put four people in hospital.
Some people travelled more than 200 miles to attend the event called EggTech or EggTek at the Kenfig Industrial Estate in Margam in Wales.
Hundreds of cars were dumped and witnesses reported seeing "semi-conscious bodies lying on the road".
Clips on TikTok and Snapchat show ravers dancing next to several speakers, indicating the scale of the illegal event.
One stage had a giant reflective green rooster on it which changed colours at night in the lights.
In some clips, the sunrise was seen peeking out over the hills as many kept dancing.
Other videos from the weekend appear to show revellers holding filled balloons and inhaling.
South Wales Police were called to the illegal event at 11.40pm on Saturday, and by Sunday lunchtime it was still going strong.
By Sunday evening, police confirmed four people had been taken to the hospital with non-serious injuries as the event was dispersed.
There have not been any arrests at this point as investigations into who the organisers are continuing.
Superintendent Steve Jones told the Mirror today: “We are reviewing all lines of enquiries following the gathering at Kenfig Industrial Estate to identify any offences under the appropriate legislation. The relevant details of some offenders have been obtained and enquiries are ongoing.
"A large majority of those who attended the event left in the late afternoon. Our resources remained in the vicinity of the scene throughout yesterday evening. The injuries of those taken to hospital remain non-serious.”
Last night, Assistant Chief Constable Mark Travis said: "We are engaging with those present at the scene to ensure they make their way from the site safely whilst respecting local residents.
"The event is now dissipating and those attending have been leaving throughout the afternoon.
"We have worked with partner agencies to ensure those who have needed help have been supported.
"It is disappointing that on one of the busiest days of the year that so many resources have been diverted from supporting local communities to manage an illegal event.
"I would like to thank the local community for their patience and support."
On Facebook, people who lived 10 miles in Port Talbot commented saying they could hear the music from the rave well into Sunday.
One wrote: "It’s still going on. I’m all for having fun but this is ridiculous. I just want to sleep in the quiet that should be my home."
Another resident added: "Wondered what that constant noise was last night. I'm near Aberavon beach and could hear it."
This weekend's event is an annual rave held over Easter weekend and changes location each year. Last year the illegal rave was held in Dorset.
Revellers told WalesOnline they find out about the event about a week before and sometimes the location can change last minute.
This year, the event was originally going to be held in Bristol before it got changed to Kenfig.
One person who attended the rave, who gave his name as Chris, travelled four hours so he could attend the event and said it's been "completely worth it".
Explaining how they find these raves, he said: "Basically they come out about a week before. Everyone sends their numbers in on the social media group and then everyone gets a group text saying: 'Ring this number on this day.'
"Then on the phone line it gives you a general area to go to. Last night it said 'head to Bristol area'. So everyone in the country going was heading to Bristol last night.
"Then that changed to Cardiff as we were driving through the night. That's the best thing. It's an adventure.
"Eventually you find out where you're going. I've been going to them for years and you get to know so many people. It says on all texts: 'Respect the land and respect the police.'
"It's just a bit of fun getting loads of people together and having a party. I've always found as long as you're nice to the police they're decent."
Nigel travelled from Hampshire to be at the gathering along with three pals.
They're not sure when they'll be heading home but insisted the event was a vital one on the techo scene.
He said: "It's a class event and this is a good place for it. Last year we had it in Dorset. 100% worth the trip."
