Note: this trick may be hard if you dont have a H2 mask go to Blackwater city. and take the taxi to the raceway (if you already beat the level) wait until the taxi stops. then activate your hologuise. walk right off the taxi. you will fall and land in the water. once you land inthe water let yourself sink ( you will sink fast) then immediately start to swim forward you will see poles. go to them, once your underneth them you will probley be in a small area.