pearl1

function MoveUp()
  turtle.digDown()
  turtle.placeDown()
  turtle.forward()
end

function TurnAround()
  turtle.turnLeft()
  turtle.turnLeft()
end

while not turtle.detectUp() do
  MoveUp()
  MoveUp()
  MoveUp()
  MoveUp()
  MoveUp()
  turtle.digDown()
  turtle.placeDown()
  TurnAround()
  sleep(120)
end