Keezhadi in Tamilnadu, India excavation commenced in 2014, so far has done at six phases and the majority of excavations were artifacts and potteries. After the sixth phase of excavation, completed in October 2020, nanotechnology usage in Keezhadi was found out and it is claimed that it is the first time that usage of nanotechnology was found out before 2,500 years ago. The articles published in scientific journals said coatings on top of the potteries excavated from Keezhadi contains carbon nanotubes. The robust mechanical properties of carbon nanotubes the coatings have lasted for so many years, says the Scientists.