english: But if you shrink that diameter to what we're attempting, which is 12 feet, which is plenty to get an electric skate through, you drop the diameter by a factor of two and the cross-sectional area by a factor of four, and the tunneling cost scales with the cross-sectional area.
non_english: Međutim, ako suzite taj prečnik na ono na šta mi ciljamo, a to je 3,7 metara, što je sasvim dovoljno da električni nosač prođe, umanjili ste prečnik za faktor od dva a prostor poprečnog preseka za faktor od četiri, a cena kopanja tunela je srazmerna poprečnom preseku.