Mullaperiyar Dam: A historic marvel built between 1887-1895, designed to divert the Periyar River for irrigation 

Lease Agreement: The 1886 Periyar Lease allowed Tamil Nadu to use water, sparking ongoing disputes with Kerala, Travancore and British India signed a 999-year lease, allowing Tamil Nadu to use Periyar's water 

Safety Concerns: The 125-year-old dam's age raises fears about structural integrity and seismic vulnerability 

Legal Battles: Tamil Nadu and Kerala have engaged in decades-long legal disputes over dam operations and water levels 

The dam remains a contentious issue between Tamil Nadu and Kerala, with ongoing legal battles