So this summer’s dumb, gonzo shark movie is French, and is about endangered sharks “evolving” and taking their “swim-eat-procreate” act up the River Seine to Paris.

“Under Paris” lives down to that “dumb” label, with diver after diver suiting up, first scene to last, before our “expert” (Bérénice Bejo of “The Artist” and “A Knight’s Tale”) blurts out the obvious…in French or dubbed into English.

“There’s no point in diving and taking this RISK!”

Shark specialist Sophia blurts this long after she’s leapt in to save her husband and her “team” tracking a tagged mako shark in the Great Pacific Garbage Patch. The water is crimson, and littered with plastic. And she’s seen the freak-out on video when four divers are attacked. But in she goes, and without a tank.

Other divers will make this mistake again and again in this heartless, pitiless, gory and cautionary thriller. It’s got a couple of killer sequences of shark-attack mayhem in the Seine and the Catacombs beneath Paris, some arresting underwater shots — but little else to recommend it.

Characters are sketched-in, with villains in the usual places — officials in the River Brigade of the police force (Aurélia Petit), a “cover this up” mayor (Anne Marivin) who wants the big Paris triathlon to go on, sharks be damned.

And the picture’s pretty harsh on dreamy-eyed environmentalists, too. Activist Mika (Léa Léviant) and her peers, locally and internationally, are portrayed as misguided shark lovers.

“They won’t hurt anyone!”

Say what now? “She’s a SHARK, not a poodle!”

Sophia is shocked to see endangered sharks in an increasingly sickly ocean start to evolve, grow huge and adapt to their threatened world.

Traumatized by the loss of her lover and her team, she must join an intrepid river cop (Nassim Lyes) to try and prevent a tragedy. Ok, more tragedies. Well, let’s leave it at “Even BIGGER tragedies.” Because that’s a hallmark of this particular “cautionary” thriller. The body count is epic.

Disaster movies, and anything do with something swimming with “Jaws,” traditionally posit a worst case scenario, and through the intrepid efforts and blind luck of a few characters we come to identify with, those depicted either avoid that scenario, survive it and/or learn from it.

Director and co-writer Xavier Gens’ bleak thriller doesn’t do much with characters and doesn’t traffic much in “hope” and a new day dawning.

The kids who visit an aquarium where Sophia works in the years after her tragedy at sea ask the most important question of all.

“Isn’t it too late to save the ocean?”

With sharks being hunted to dangerous levels, an oceanic garbage patch six times the size of France, wildlife dying from plastic debris and plastic entering the food chain all the way up to people, maybe it is “too late.”

But maybe if our two heroes try their best, cook up a plan or somehow benefit from a series of coincidences, maybe Paris, the “City of Light,” can be saved.

Maybe. Maybe not.

Rating: TV-MA, graphic, gory violence

Cast: Bérénice Bejo, Nassim Lyes, Léa Léviant, Aurélia Petit, Yannick Choirat and Anne Marivin.

Credits: Directed by Xavier Gens, scripted by Yannick Dahan, Maud Heywang and Xavier Gens. A Netflix release.

Running time: 1:44