Spiral Tribe is a free party sound system which existed in the first half of the 1990s, and became active again in 2007 and continues to host club nights and parties in the UK and across Europe. The collective originated in west London and later travelled across Europe and North America. According to one member, the name came to him when he was at work, staring at a poster of the interconnecting spirals in an ammonite shell. The group had a huge influence on the emerging free tekno subculture. Members of the collective released seminal records on their label, Network 23. Debbie and Mark also starred in the cult German feature documentary " London Underground" made during the summer of 1992.