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

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

turtle.turnRight();

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

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

while turtle.detect()
do
  turtle.dig();
  turtle.up();
end

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

print("DONE!!!");