What is "nanosubmarine"

Nanosubmarines, or nanosubs, are synthetic microscopic devices that can navigate and perform specific tasks within the human body. Most of the self-propelled devices will be used to detect substances, decontaminate the environment, perform targeted drug delivery, conduct microsurgery and destroy malicious cells. Nanosubmarines use a variety of methods to navigate through the body; currently the preferred method uses the electrochemical properties of molecules. There have been multiple successful tests using this technology to heal mice with inflammatory bowel diseases. The general goal of nanosubmarines is to be able to produce a machine which can sense and respond autonomously, all while being fueled by its environment.