Mining 2x2 tunnel

--start in bottom right corner
local mineDis = 1
-- how far you want the tunnels to go
local tunnels = 1
-- how meny tunnels

-- mining function
function mine()
   for i = 1,mineDis do
      turtle.dig()
      turtle.turnLeft()
      turtle.forward()
      turtle.turnRight()
      turtle.dig()
      turtle.up()
      turtle.dig()
      turtle.turnRight()
      turtle.forward()
      turtle.turnLeft()
      turtle.dig()
      turtle.down()
      turtle.forward()
   end
end

function backToStart()
   for i = 1,mineDis do
      turtle.back()
   end
end

function nextTunnel()
   turtle.turnLeft()
   turtle.forward()
   turtle.forward()
   turtle.forward()
   turtle.forward()
   turtle.turnRight()
   print("New Tunnel")
end

function start()
   for i = 1,tunnels do
      mine()
      backToStart()
      nextTunnel()
   end
end

start()