"New Dive Mask Lets Marines Talk Underwater"

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“In comparison to the half mask, the full-face mask reduces heat loss during cold water operations and protects the diver’s face from exposure to environmental conditions,” Balchun said. “The mask also allows the integration of an underwater voice communications system. … Finally, diver safety is increased by providing a constant air supply to the diver in the event he loses consciousness.”

http://marinecorpstimes.com/news/2011/04/marines-new-dive-mask-lets-marines-talk-underwater-041611/