German scientists were trying to think outside of the box on this one. During the early 1940s, engineers had developed a sonic cannon that they believed would literally vibrate a person apart from the inside out. The project was the brainchild of Dr. Richard Wallauschek. It was made up of a methane gas combustion chamber leading to two large parabolic reflectors, which had a diameter of almost 10 feet (3 m). These reflectors were pulse detonated at around 44 Hz and were connected to another chamber consisting of several sub-unit firing tubes. These tubes would allow a mixture of the methane gas and oxygen in the combustion chamber. This would then ignite and turn the gases into noise that would cause vertigo and nausea at 900 feet (300 yards) by vibrating the middle ear bones and shaking the cochlear fluid within the inner ear. The pressure caused by these sound waves would be fatal at 164 feet (50 m) in less than a minute!

I’m no scientist so I have no idea how of any of that works, but I’m not convinced. Apparently, it was only tested on laboratory animals. Regardless, a large apparatus such as this would be an easy target for enemy fire. So, it seems like if there was any damage to the sensitive parabolic reflectors, it would make the entire thing ineffective. It appears as if Hitler agreed and the project was never put into use.