HYDERABAD: India along with 23 other nations, would be participating in a major Indian ocean-wide tsunami mock exercise (drill) on September four and five, which would involve evacuation of thousands of people from coastal areas in over half a dozen states.The exercise, known as IOWave18, is being organised by the Intergovernmental Oceanographic Commission (IOC) of UNESCO, which coordinated the setting up of the Indian Ocean Tsunami Warning and Mitigation System (IOTWMS) in the aftermath of December 26, 2004 tsunami, an official release said here Monday.The Indian Tsunami Early Warning Centre (ITEWC), based out of the Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, is an autonomous institution under the Union Ministry of Earth Sciences.The state-of-the-art warning centre, operational since October 2007, has all necessary computational and communication infrastructure for the reception of real-time data from seismic and sea-level networks, tsunami modeling, as well as generation and dissemination of tsunami bulletins for the entire Indian Ocean region, it said."The IOWave18 exercise will simulate Indian Ocean countries being put in a tsunami warning situation and require the National Tsunami Warning Centre (NTWC), i.e., INCOIS in case of India, and the National and Local Disaster Management Offices (NDMO/LDMO) to implement their Standard Operating Procedures (SOPs)," it said.The release further said, besides testing the SOPs and communication links at all levels of the warning chain, a primary objective of IOWave18 exercise is to enhance tsunami preparedness at community level.The purpose of the exercise is to increase tsunami preparedness, evaluate response capabilities in each state and improve coordination throughout the region.The exercise would involve the evacuation of more than 1,25,000 people from the coastal communities of Odisha, Andaman and Nicobar Islands, Andhra Pradesh, Tamil Nadu , Puducherry, Maharashtra, West Bengal, Gujarat and Goa, the release said.