'A Life Illuminated,' a documentary about deep-sea biologist Edie Widder, screens once at the Roxie on Sunday, Aug. 2 — followed by a live Q&A with the director, moderated by legendary oceanographer Dr. Sylvia Earle.

What: A Life Illuminated, Tasha Van Zandt's 2025 documentary (1h 29m), followed by a live Q&A with the director. When: Sunday, Aug. 2, 12:50 p.m. — one showing only. Where: the Big Roxie auditorium, 3117 16th Street, in the Mission. Tickets at roxie.com; the film page doesn't post a set price as of Friday, but Roxie members get in free or discounted, so check before you pay.

The film follows Dr. Edie Widder, a marine biologist who was among the first women in her field — and among the first people to descend into the ocean's "twilight zone," some 3,300 feet down where sunlight gives out. Widder helped capture the first-ever footage of a live giant squid and has spent decades chasing bioluminescence, the cold glow that deep-sea creatures make themselves. Indiewire called it "a classic, stick-to-your-ribs documentary experience about a fascinating person."

Here's the reason to move it up your Sunday: the post-screening Q&A is moderated by Dr. Sylvia Earle — the former NOAA chief scientist and National Geographic explorer nicknamed "Her Deepness," who once walked the seafloor untethered at 1,250 feet. Two of ocean science's most quietly famous people, in one small Mission theater, talking about the dark part of the planet almost nobody sees. That's not a thing that comes around twice.

The move: it's a 12:50 matinee and a single showing with a marquee guest, so buy ahead rather than walking up — and even if you've already seen the film, come for the Q&A, which is the part you can't stream later.