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"I thought it was best to be prepared," Steve said. "You know how these work?" Rick nodded. "We both do." The rebreathers, unlike Scubas, which were filled with compressed air, used oxygen which was recycled through a canister of chemicals that removed water vapor and carbon dioxide. They were completely self-contained; no bubbles were emitted.
Then, with a glance at his compass to orient him, Rick started the long swim. It was odd to be wearing the oxygen lung. The sound of bubbles from the customary compressed-air Scubas was missing, and the silence was strange. Then Steve started the motor of the runabout and Rick heard the broken rhythm as the motor skipped.
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