Researchers find North Atlantic great whites spend their first 20 years in the waters off Montauk, Long Island.

After several decades of decline, great white sharks in the North Atlantic are finally on the rise. That’s great news for ecosystem health, even if it freaks out beach goers. But scientists still know little about the migratory patterns of young sharks, which is a challenge for conservationists.

Now, a group of researchers think they’ve located a shark “nursery”—the first found in the North Atlantic.