Mine 0.5

turtle.refuel()
length=0
length2=0
width=0
torchC=0
lengthSave=0
widthSave=0
print("Enter length")
length=read()
lengthSave=length
print("Enter width")
width=read()
widthSave=width
print("Enter count")
Grave=tonumber(read())
print("Yes Boss")
function dig()
 turtle.dig()
 turtle.forward()
 turtle.digDown()
 turtle.digUp()
end
function chest()
 if turtle.getItemCount(16)>0 then
   turtle.down()
   turtle.digDown()
   turtle.select(2)
   turtle.placeDown()
   for i=16,3,-1 do turtle.select(i); turtle.dropDown() end
   turtle.up()
 elseif turtle.getFuelLevel()<1 then exit() end
end
function torch()
 if torchC==0 then
  turtle.select(1)
  turtle.placeDown()
  torchC=6
  else
  torchC=torchC-1
 end
end
print(type(Grave))
print(type(width))
while Grave~=0 do
 length=length-1
 repeat
  length=length-1
  dig()
  torch()
  chest()
 until length==0
 if Grave==1 then exit()
 end
 Grave=Grave-1
 if Grave%2==1 and width~=0 then
  turtle.turnLeft()
   width=width+1
   repeat
    width=width-1
    dig()
    torch()
    chest()
   until width==0
  turtle.turnLeft()
 elseif Grave%2==0 and width~=0 then
   turtle.turnRight()
   width=width+1
   repeat
    width=width-1
    dig()
    torch()
    chest()
   until width==0
  turtle.turnRight()
 elseif width==0 and Grave%2==1 then
  turtle.turnLeft()
  dig()
  torch()
  chest()
  turtle.turnLeft()
 elseif width==0 and Grave%2==0 then
  turtle.turnRight()
  dig()
  torch()
  chest()
  turtle.turnRight()
 end
 width=widthSave
 length=lengthSave
end