Some time in the last century a sound experiment was carried out using a large (wooden?) whistle structure (possibly in France). This was given the title "Level 7" following the sound frequency used (7 Hz). This was so powerful that it killed one person involved in the experiment.

This article uses material from the Wikipedia article Level 7 sound experiment, that was deleted or is being discussed for deletion, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License.
Author(s): Chris the Paleontologist Search for "Level 7 sound experiment" on Google
View Wikipedia's deletion log of "Level 7 sound experiment"

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.