tunel

function felas ()
  for n = 1,4 do
    turtle.dig()
    turtle.up()
  end
  turtle.dig()
end

function leas()
  for m = 1,4
    turtle.dig()
    turtle.down()
  end
  turtle.dig()
end

function bal ()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
end

function jobb ()
  turtle.turnRight()
  turtle.forward()
  turtle.turn.Left()
end

function as()
  while bool do
    if turtle.detect() then
      turtle.dig()
    else
      bool=false
    end
  end
end

for i = 1,x do
  for g = 1,2 do
    felas()
    bal()
    leas()
    bal()
  end
  felas()
  for h = 1,4 do
    turtle.down()
  end
  for h = 1,4 do
    as()
    jobb()
  end
  as()
  turtle.forward()
end