However long and wide you want to dig it.
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m3 is a cubic meter. It is the volume equivalent of a cube 1 meter wide by 1 meter deep by 1 meter tall. 1 m3 is equivalent to 1000 liters.
8 square meters
8 meters wide by 5 meters long my 1 meters tall will not give you an answer in square meters. But it will give you a VOLUME of 40 cubic meters.
1*2.5*1.5=3.75m^3