How do you beat the underport?

Ok, I've beaten Jak 26 times already, and before you ask, no I don't get much sleep.

I actually beat the underport for the 6th time today. It is annoying. but here's how it is. When you get there and go underwater in the robot thing go all the way around the mines. They sway from side to side trying to touch you so move fast. But if youu go around they can't move fast. Ignore the beeping when you have low air, there are refils everywere. Be sure to punch the stingy fish type deals before they get you. This is all pretty easy if you actually try, but if they get you punch and jump. When you get on dry land you will find sig soon. you'll see that stupid catapiller so run like heck. Don't over shoot your jumps because this sectoin is tricky. When you see the box's shortly after you escape the catapiller thing, just ignore sig and the metal heads and get to work. (remember, he carries a peace maker) you'll see the bug once again, so remeber to plant your jumps and dodge the electricity. When this is over ther will be a cut scene and you're basically done.