The ocean only has to warm about two degrees for coral to die, and guess what? The ocean is warming and the coral is dying. Much of it is dead already. It’s not just sad because we’re losing a beautiful animal; coral is vital to our ocean’s ecosystems, and when coral dies, so do many other species in the ocean, and it’s only a matter of time before we ourselves feel dire repercussions. Coral are the trees of the ocean, and their extinction en masse cannot and will not go unnoticed. The question is: will we notice before it’s too late?

One diver, Richard Vevers, realizes the ocean has a bit of an advertising issue: it’s out of sight, and largely out of mind. But if he could find a way to show us at home what’s going on beneath the waves, might we pay attention? Inspired by the film Chasing Ice, which captured the receding glaciers through years of time-lapse, Richard thought the same technique could be applied to the reefs, so he called up director Jeff Orlowski, and an idea was born.

Underwater time lapse meant nothing short of a new invention was necessary. A whole team built special cameras that could exist in salt water for months a time, in the cold, under great depth and pressure, subject to storms, and needing not only to be wiped clean regularly, but to host a router that would send the images back. This is how they meet Zackery Rago, who’s part of the camera building team but also has a secret passion for coral. They position their cameras in the reefs of Hawaii, the Bahamas, and Bermuda, but nature and technology conspire against them. In the end, it’s necessary for them to go down and record this massive bleaching event themselves.

Another lesson learned: watching a beautiful animal die is hard. Watching them practically go extinct is wrenching. 2016 was a bad year for coral. 29% of the Great Barrier Reef died in 2016 alone. In 30 years, we could lose it all. White coral is a shock, of course. The white is the coral’s exposed skeleton. Death is imminent. Dead coral is even sadder, devoid of any life or colour.  While the time lapse originally meant that they could observe this happening from a distance, the modified plan of divers capturing the footage themselves means they are confronted with this death and dying in person, and they find that quite devastating. I think you will too and I think you should watch anyway.

Kristen Bell recorded a song specifically for use in the film. She feels strongly about the film’s message, but I think the hope is that we all will, and feel galvanized into action. You can start with Vever’s The Ocean Agency and suggestions found at Chasing Coral. But I think just not turning away from this is the important thing.