Anything that promotes conservation and awareness is good, and in this case, conservationists concerned about the giant manta (being hunted, often illegally, for the Asian medicinal market) achieved their objective. Borrowing a technique from whale lovers, Blue Sphere Media sent a human model (obviously a talented diver/breath holder) down to film this dance.
We don't even have a complete scientific picture of this fish yet. A second species was described just a few years ago, and there may be others. The Kon-Tiki raft crew described passing mantas on the surface "the size of the floor of a room," and claims have been made for matas much larger than the 8m or so accepted as the maximum "wingspan."