This season’s NCIS: LA finale is “without a doubt the darkest season-finale we’ve ever done on the show,” according to executive producer Shane Brennan. And the proof is in the promo.

EW has your exclusive first look at the episode, which finds the team going to new lengths to recover the stolen nuclear weapons they’ve been tracking. The result? An episode that will make for some juicy team drama and could leave at least one life in jeopardy. “It’s big in many, many ways,” Brennan previews.

In the video below, we get a taste of exactly what Brennan means.

What is happening to Deeks!? Why does Sam appear to be lifelessly floating in a body of water?

Brennan is coy on specifics, but warns of some scenes: “People will actually squirm. … When I watched the cut, I had to look away.”

Meanwhile, if Kensi and Deeks appear to be closer than usual in the promo, hold on to your hats for the actual scene. “There is a massive, massive moment that will shock Kensi and Deeks fans,” Brennan teases.

NCIS: LA’s season finale airs May 14 at 9 p.m. ET.

Source: EW