tunnel

local tArgs = {...}
width = tonumber(tArgs[1])
height = tonumber(tArgs[2])
distance = tonumber(tArgs[3])

for d=1,distance do
  turtle.dig()
  turtle.forward()
  turtle.turnRight()

  first = true
  for h=1,height do
    if first == false then
      turtle.digUp()
      turtle.up()
      turtle.turnRight()
    end
    first = false
    for w=1,(width - 1) do
      turtle.dig()
      turtle.forward()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for w=1,(width - 1) do
        turtle.forward()
    end
    turtle.turnRight()
  end
  for h=1,(height-1) do
    turtle.down()
  end
end