Via: VideoSift
A pair of marine biologists descend down a deep coral-reef drop-off in the central Pacific, using high-tech closed-circuit rebreathers and breathing a mixture containing mostly helium. As they pass a depth of 320 feet on the way down, they discover what it feels like to penetrate a thermocline from the balmy 85-degree equatorial sea-surface temperatures, to the 50-degree deep upwelled water below. The diver carrying the camera, who was wearng only a t-shirt and swimsuit under his rebreather gear, had no idea that every helium-affected word he was saying was being picked up by the camera's microphone.
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