The National Board for Wildlife (NBWL) has given approval to construct training walls at the Pazhaverkadu estuary to stabilise the bar mouth, which often gets closed due to silting. Fishermen of Pulicat, a vast brackish water lake with three estuaries, have been demanding the construction of these walls for a long time to keep the Pazhaverkadu estuary open during all seasons. The exchange of water is vital for maintaining the lake’s ecosystem. If seawater does not enter, salinity and pH levels will change and crabs and prawns unique to the lake cannot survive.