It all started with four milk crates holding up a piece of plywood in a makeshift office — and, of course, a passion for skiing and riding. This season, Teton Gravity Research celebrates 30 years of filmmaking with “Pressure Drop” at the Vilar Performing Arts Center on Oct. 3.

“Pressure Drop” portrays “that fleeting space between calm and chaos …” when the mountain demands all of your energy, attention and physicality. “It’s the moment before gravity takes over,” according to the press release. Like every TGR film, this one features an abundance of big mountain lines, huge flips and a couple of crashes. Basically, it’s about dedicating your life to the fall line, because your life truly depends on it.

The film features some fun retro footage — and jackets — as TGR looks back on its progress, which began with the belief that ski movies needed something different. Cofounder Todd Jones talks about how they started out in Jackson Hole — “dirtbags” chasing impressive athletes around the mountain and eventually piquing those skiers’ and riders’ interest in starring in their films. Jones credits Jackson Hole athletes for playing an enormous role in TGR’s success.

“I feel like we’ve captured amazing things along the way,” he said. “I’d do it over again if I had to, and I don’t think I’d change much.”

Footage of helicopters flying over snow-drenched, steeper-than-steep mountaintops, drone angles of athletes flying through the air and some beautiful powder shots make you almost want to fast forward to those cold, wintery days — or at least book a room in the places “Pressure Drop” features Haines and the legendary Valdez, Alaska; the Lofoten Islands in Norway; Palisades Tahoe; Grand Targhee; British Columbia; and, of course, Jackson Hole.

As Jones says about the early days in Jackson: “Life was simple. You just got in that red box, and everything was OK.”

Current athletes in this season’s film include Kai Jones — who you’d never know had such a devastating accident a few years ago — with a few clips of him as a little kid talking about how much he loves feeling like he’s flying when he’s on the snow. Other athletes include Maggie Voisin and her tendency to overpack, Nick McNutt and Sage Cattabriga-Alosa.

One fun segment showcases Jeremy Jones riding with his two grown kids at Palisades Tahoe. He starred in TGR’s first film 30 years ago. Now his kids rip, while he wonders whether or not he should be letting them tackle certain lines and admits that he’d rather be the one doing it — not for the glory, but simply to reduce his worry factor.

Though it’s called “Pressure Drop,” there are some silly, playful scenes, particularly one involving a snowman and athletes bouncing off tree trunks. Historic footage also includes a flashback of Cattabriga-Alosa masterfully navigating a huge crevice.

Northern Lights and first descents in Norway also make an impact in the film.

Like all ski flicks, this one is full of stoke and reminds people to love what they’re doing, and, of course, do what they love.