1x2 tunnel with light

--Place stack of torches in Slot 1

--Will place a torch every 13 blocks for 64 iterations
tunnel=64

--Number of spaces moved before placing another torch
 number=13

--Initial start
turtle.digUp()
turtle.up()

--Main Program
for t=1,tunnel do
 turtle.placeDown()
 for n=1,number do
  turtle.dig()
  turtle.forward()
  if turtle.detectDown() then
   turtle.digDown()
  end
 end
end