local B_x = 0
local B_z = 0
local B_y = 0

local orient = 0

local depth = 3
local width = 2

function dig(f)
print("starting")
 for i=1,depth do
 turtle.dig()
 turtle.forward()
 turtle.digUp()
 turtle.digDown()
 B_x=B_x+(f*1)
 end

 if (orient==0) do
  turnright()
 else if(orient==2) do
  turnleft()
 end

end

function turnright()

 if width >1 then
  turtle.turnRight()
  turtle.dig()
  turtle.forward()
  turtle.turnRight()
  B_z=B_z+1
  width = width -1
  orient = orient +2
  dig(-1)
 else
  comeback()
 end

end

function comeback()
print("returning")

 while orient >4 do
  orient = orient -4
 end


 for i=1, B_x do
  turtle.back()
 end

 if orient == 2 do
  turtle.turnRight()
  orient = 3
 end

 for i=1 B_y do
  turtle.forward()
 end

  turtle.drop()
end


dig(1)
comeback()