Getting to grips with a poorly done repair to the bottom

This repair to the bottom is a poorly done repair and is very dangerous in that it does not have any strength in it and the first time the boat was put under any stress would fail and the boat would founder.

A photo showing it is not just one plank joint but three planks side by side 

The wood used in the repair was substandard

The extent of the rot is wide spread on the port side