It almost looks like a scene out of a horror movie, but what a student in Hawaii has captured on video has never been seen before.

Watch this video from Scripps Oceanography that depicts an aggregation of anchovies that is so massive it looks like a black cloud in the water.

“It’s like a black cloud of fish and you stick your hand out and it’s like a force field the way they all swim away from you,” Julia Fieldler a student of oceanography at the Scripps Research Institute told ABC news. “It’s kind of fun swimming into the middle of them. You don’t exactly know when you’re going to come out on the other side or if they’re going to disperse. It was crazy.”