KOLKATA: A US-based startup has started testing the stability of the Kolkata Gate's ring in New Town using artificial intelligence (AI) and internet-of things (IOT) technology that monitors natural vibrations and deflections. Last year, a spherical structure with the Biswa Bangla logo fixed to the Kolkata Gate fell from a height of 40 metres. Since then, the authorities have been looking into all safety aspects of the entire structure, which has a hanging restaurant at the top. Officials said that there is no plan right now to re-attach the globe to the Kolkata Gate. Last week, the startup representatives met senior officials of Hidco.