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Hopefully someone can help, getting frustrated here.

On Route Canal:

I have to get across from one tunnel to another at 90 degrees to the left of it, with a water filled area in between, both tunnel entrances are above the water.

There's not much there, just one barrel under the water, which I've tried moving around to no effect. The tunnel I have to reach seems too high and far to jump to, but I can't see any other way of getting to it. Is it just a question of improving my jumping skills? :dozey:

There were two police shooting at me from the grating in the roof, but I finished them off. I've tried back tracking, but it seems that the game doesn't want me to go back, get lots of cops shooting at me and new ones keep coming.

thanks