The cable runs under the radiator support from the driver's side (North America) to the area under the hood emblem. The cable comes to about 4 inches of the center of the hood when it passes through a metal plate and then attaches to the hood latch mechanism where it activates the first latch and pops the hood tab.
Get a good flashlight and try to visualize where the radiator support is and you should be able to locate the latch. With a wire hook, you might be able to yank on the cable enough to pop the hood release tab out.
If you can't get that far, then the alternative is to break the plastic grill on the driver's side and sacrifice one of the chrome strips. Luckily, they are both really cheap replacement parts.