Montauk Shark Hunters Tracked a Nuclear Mutant Until Lab Results Told a Different Story

New Yorkers already knew a giant shark named Ernst was patrolling their coastline this summer.

Then marine biologists found bite marks near Montauk too big and too violent to explain away.

One scientist floated a theory about leaking nuclear waste and something impossible living in that canyon.

A Humpback Whale Bite Mark Started the Hunt

A nearly 12-foot shark went to work off Long Island this summer, and she left evidence behind.

She sank her teeth into a humpback whale near Montauk.

The bite mark measured two feet across.

She hit a grey seal next, tearing a 22-inch gash into it.

Then she went after 400-pound tuna in the same stretch of water.

Marine scientist Craig O'Connell tracked the pattern, and he and his team gave her a name built for a monster movie.

O'Connell's hunt is the subject of Discovery Channel's "Sharkzilla Takes New York," a new Shark Week special.

He didn't stop at cataloging the damage.

He went looking for what could have made a shark hit this hard.

Decades-Old Barrels Buried the Answer

O'Connell's search led straight to a Cold War-era dumping ground sitting under the Hudson Canyon.

"They dumped 15,000 barrels of nuclear waste in the Hudson Canyon," O'Connell said, dating the operation to the late 1960s.

A decade later, inspectors went back down to check on the drums, and every last one had failed.

That detail turned a shark hunt into something bigger.

O'Connell's theory: radioactive leaks sitting on the ocean floor for half a century are still reaching the animals swimming above them.

If a predator soaked up enough of that exposure, he theorized, it could grow faster, stronger, and meaner than anything else in the water.

He wasn't just chasing a shark anymore.

He was chasing a possible explanation for an entire canyon full of oversized, aggressive marine life.

Montauk has long been ground zero for shark stories like this one.

A 12-foot, 1,000-pound great white named Ernst was tracked off that same coastline in June before continuing north.

A second great white, a nearly 14-foot, 1,700-pound male named Contender, has been following a similar migration route up the East Coast.

Long Island beaches have added drone patrols this summer because of the rise in sightings.

O'Connell has said Montauk was once the place anglers went to land the biggest sharks around, with the records to prove it.

He's said outright that those giants were fished out of these waters decades ago.

Now he believes the evidence is showing they're finally coming back.

The Test That Ended the Mutant Theory

O'Connell tagged the shark and pulled tissue samples for radioactive testing.

That's the moment the story could have gone one of two ways.

The lab results came back, and there was no radiation in Sharkzilla.

No mutation.

No Hudson Canyon monster.

What the tests showed was a mako, the ocean's fastest shark, and scientists say she's pregnant.

A pregnant mako shark explains the whale bite, the seal gash, and the tuna kills better than any nuclear waste theory ever could.

Pregnant females need calories, and they don't wait around for easy prey.

The Hudson Canyon has become a breeding ground for these sharks, and the females hunting there are doing exactly what evolution built them to do.

Why the Story Still Works Without the Mutant

Nobody needed radioactive contamination to explain a shark capable of biting a two-foot chunk out of a whale.

The real explanation is a coastline where decades of overfishing wiped out the biggest predators, now watching them come back in force.

Ernst, Contender, and Sharkzilla weren't summoned by nuclear barrels rusting on the ocean floor.

They're a sign that Long Island's waters can support apex predators again, at sizes nobody's tracked there in years.

That's a better story than a mutant, and it's also a true one.

Sources:

• Natalie O'Neill, "12-foot 'Sharkzilla' lurking in NY waters — and her massive bite marks have triggered wild mutant theories," New York Post, July 31, 2026.
• "Shark Sightings Surge Across New York Beaches as Great White Heads North," Newsweek, July 30, 2026.
• AOL, "'Sharkzilla Takes New York' Shark Week Special: How to Watch in NY," AOL, July 31, 2026.