Oooooahh… what a cool Under ground/water party we did last saturday night.. in the Tram-tube of the Piet Hein Tunnel, 20m under water!! The police were friendly to us when they stopped us at 7:00 AM. (tunnel inspectors found us during a routine safety check they do every sunday morning)
We used excisting infrastructure for the party: electricity, lighting, even the the DJ booth and bar was allready there and not moved from its original location. The only problem was removing the shit the next morning from our primitive toilet and the dirt in our hairs….
The only negative point was that all our cash was stolen from the bar, not very nice because this was – off course – a free party!