How were Roman war boats built? (The ones that were long and narrow and used in the Carthaginian War?)?

I need to know for a school report and it has to be pretty exact... i cannot find it on the internet at all!!How were Roman war boats built? (The ones that were long and narrow and used in the Carthaginian War?)?
The design evolved from earlier greek designs. first internal frame and planking then plank %26amp; spline.



The largest of thier boats still retained the internal framing methods.



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