World's Deepest Rave

Roni Size's underground rave at Cwmorthin Slate Mine 1,375 feet below ground.

Oct 23, 2026

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World's Deepest Rave

Roni Size's underground rave at Cwmorthin Slate Mine 1,375 feet below ground.

In brief

Roni Size's underground rave at Cwmorthin Slate Mine 1,375 feet below ground. Roni Size played a record-breaking underground rave at Cwmorthin Slate Mine 1,375 feet below ground in North Wales. Originally reported by LADbible.

The descent

The descent was no walk into the park (LADbible)

A small group made a treacherous two-hour descent to Cwmorthin Slate Mine 1,375 feet below ground in North Wales.

Roni Size's set

A protective helmet remained on Roni Size at all times, even in the DJ booth (G-Shock/Casio)

Roni Size played a drum and bass set 419 metres below ground at Cwmorthin Slate Mine.

Scientific setup

Some of the kit used for the scientific side of what is hoped to be the world's deepest underground rave (LADbible)

G-Shock used vibration transducers and hydrophones to capture sound traveling through slate, rock and mud.

Rave atmosphere

The rave at Cwmorthin Slate Mine hopes to earn a spot in the record books (G-Shock/Casio)

The Welsh national anthem rang out before Roni Size's set began at Cwmorthin Slate Mine.

Rave preparation

The team took three days to haul all equipment through pitch-black caverns for the underground rave.

Rave experience

Roni Size's set was preceded by a nod to the surroundings and the Welsh national anthem.

Rave safety

Rave safety

A protective helmet remained on Roni Size at all times, even in the DJ booth.

Rave location

Cwmorthin Slate Mine is a 1997-closed slate mine in North Wales.

Rave significance

This event aims to become the world's deepest underground rave in history.

Rave outcome

I went to the world’s deepest rave and getting there was more terrifying than you’d think

The rave was successfully completed with no injuries after a six-week preparation.

The key point

Roni Size played a record-breaking underground rave at Cwmorthin Slate Mine 1,375 feet below ground in North Wales.

Read the original on LADbible

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