a device fascinating in both its concept and its application: "Helium Speech Unscrambler" https://d23ikka7d3ekew.cloudfront.net/Manufacturers/Nautronix/Helium-speech-unscrambler.pdf
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@whitequark Do you know how divers deal with it while together in a bell?
@robryk @whitequark they just get used to it
@robryk nope