MUSIC festival bosses turned a portable toilet from the highway to hell into a stairway to heaven.

Portable toilets at festivals are normally associated with unspeakable squalor but music lovers in Budapest, Hungary, discovered one door led to a secret rave.

Amazing video footage shows revellers opening the door to a portable loo at the Sziget Festival and entering a mysterious passageway.

The clip, captured by Jaimy Spuy, shows excited music lovers squeezing past each other to wander in and out of the loo – which still has two white hand dryers attached on the wall.

The footage, filmed on a camera phone, then follows a stream of people, through a dark tunnel and into an open space full of raving dancers.

Strobe lights can be seen filling up the inflatable room filled with around one hundred portaloo-party discoverers.

The innovative move is believed to be a first for the seven day festival, known for it’s diverse line up including everything from EDM, house and techno to rock, pop and indie music.

Fabian Ruivenkamp from Middelharnis in the Western Netherlands managed to come across the toilet rave with his friends.

He shared the video on Facebook, attracting almost 2,000 views, writing: “This is why I love Sziget.

“Just open a random toilet and there is a secret party going on.”

Speaking today he said: “No one at the festival crew told us about it so it was really a secret party.

“We heard about it from other people. I think this what’s the first time because I was there last year and we didn’t heard about it.”

He added: “The festival is so magic that it’s like you’re at an another world.”

Sziget Festival is a multi-genre island festival in Budapest, Hungary and ran from the 9 to 16 August this year, attracting 450,000 people.

Past acts have included Muse, Kasabian, Rihanna and the Chainsmokers.

The festival also includes an amusement park.

In 2012, Sziget Festival was voted the best music festival in Europe by the European Festival Awards, even beating popular festivals such as Glastonbury.

A full seven day ticket can cost up to £300 and includes camping.