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I think they had a hard cover that went over the olympic pool. I don't know where I got that info from originally, but the more I think about it the more unfeasible it sounds, particularly with regards to acoustics in the pool hall and the place getting trashed with booze, pills and fag smoke. I'd have to see the video from that night but it would make much more sense for it to have been either in the big sports hall where all the basketball courts etc are (were?) or out in the running stadium (though I think they were indoors).
Jonny69-
I'd imagine it was in the halls where they used to have the hard courts i used to do sports tournaments in there as a teenager and watched basketball ball there once so probably big enough. I've been to a few raves in leisure centres and one on a covered ice rink. They used to make decent venues as everything was on site parking, toilets, cafe/bar sometimes as long as security could keep people out of the closed off areas
Retro_Bastard
I'm really intrigued now as to how they actually set up the space, and why they'd allow ravers all over their sports facilities. It is a big building, but I just thought most of it was the swimming pool.