turtle.dig();
turtle.forward();

while turtle.detectUp() or turtle.detect()
do
  turtle.digUp();
  turtle.dig();
  turtle.up();
end

turtle.forward();

while not turtle.detectDown()
do
  turtle.dig();
  turtle.down();
  turtle.dig();
end

turtle.forward();
turtle.turnRight();
turtle.dig();
turtle.forward();
turtle.turnRight();

while turtle.detectUp() or turtle.detect()
do
  turtle.digUp();
  turtle.dig();
  turtle.up();
end

turtle.forward();

while not turtle.detectDown()
do
  turtle.dig();
  turtle.down();
  turtle.dig();
end

turtle.forward();
turtle.turnRight();
turtle.forward();
turtle.dig();
turtle.forward();
turtle.turnRight();

while turtle.detectUp() or turtle.detect()
do
  turtle.digUp();
  turtle.dig();
  turtle.up();
end

turtle.forward();

while not turtle.detectDown()
do
  turtle.dig();
  turtle.down();
  turtle.dig();
end

turtle.turnRight();
turtle.forward();
turtle.turnRight();

print("DONE!!!");