Environmental groups are suing the Navy to stop plans for an offshore training range off the Georgia and Florida coasts.
They say the military didn’t properly assess the threat to endangered right whales.
The Southern Environmental Law Center filed the lawsuit on behalf of 12 conservation groups in U.S. District Court in Brunswick.
Last year, the navy announced it wanted to begin laying underwater cables and sensors for training exercises with ships, submarines and aircraft from the Kings Bay Naval Submarine Base in Georgia.
The groups say the training area is too close to where the whales migrate each winter and give birth to their calves.
Researchers estimate as few as 300 of the giant whales remain.