Krakatoa is a 1933 American Pre-Code short documentary film produced by Joe Rock.
This film was notable for overwhelming the sound systems of the cinemas of the time.
In Australia, the distributors insisted on a power output of 10 watts RMS as a minimum for cinemas wishing to show the film.
[citation needed] The story describes how the 1883 eruption of Krakatoa on the island blew half of the large island into the air that produced a tsunami, and an air wave that was felt seven times around the globe.
The eruption also emitted tons of dust that dimmed sunlight all over the world for many months.