PopSci found the lost and forgotten first underwater film.
It's a story too strange and horrifying to be fiction (and, yes, it involves a shark and a horse).
Also, it's the first footage of a shark ever recorded.
In 1916, the silent film adaptation of Jules Verne's "Twenty Thousand Leagues Under the Sea" marked the first time the world saw below the ocean's surface in motion pictures...
Except, actually, it was the second time.
The first movie filmed underwater was made by J.E. Williamson-thanks in large part to his invention, the photosphere.
See the lost film footage for the first time in decades, and hear the story of the making of "The Terrors of the Deep."
This video is part three of Experimentals : Nautiluses
Watch the full episode here