Section 63: Underground & Unmastered – Documenting Underground London Raves The book is 24cm x 17cm, and the 144 pages are printed on premium heavyweight paper. In Section 63: Underground & Unmastered – Documenting Underground London Raves, photographer Yushy documents the growing hunger for the DIY spirit of dance music, a renaissance of feeling reminiscent of the early 90s. Embedding himself with various crews across London, he gained their trust and friendship, stepping into their world and their fight to reclaim forgotten spaces to play music for the people just for a night.