This document provides information about coastal security in Tamil Nadu, India. It outlines that Tamil Nadu has a 1076 km coastline across 13 coastal districts, which is patrolled and secured by various agencies like the Indian Navy, Indian Coast Guard, and Tamil Nadu Coastal Security Group (CSG). The CSG was formed in 1994 and operates across 12 marine police stations and checkpoints along the coast. It uses boats and patrols to monitor for smuggling and security threats up to 12 nautical miles from shore. The CSG control room operates 24/7 to respond to distress calls on its toll-free number.