This is an eco-sensitive zone, involving massive infrastructure, they say

Around 50 environmentalists from across the country have written to the Union Environment Ministry that Chief Minister Narendra Modi’s pet project, Statue of Unity, envisaging a 182- metre statue of Sardar Patel inside Narmada river, 3.2 km downstream of Sardar Sarovar Dam and Shoolpaneshar Sanctuary, was working without environment approval.