This robot grows automatically longer and can make its own path to get desired location . It's work same like plant choose its path to grow further .
Scientists made thus robot by using polyethylene and it can grow upto 75 meter and it can change the direction of path by pumping air through internal chamber.
Read the report which was published by researchers Report Of Worm Robot
I Recommend you to first watch this video
They have explained the proper working of worm robot through this image
