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"Another incident occurred�which was cause for greater concern. During their descent into the 308 tunnel from 270 Rock on the way in, Parker said that he was working fairly hard, just trying to get the DPV to behave in some tight turns, when suddenly he noticed the unmistakable sensation of facial twitching and numbness in his lips. He immediately switched to his 5th (!) independent stage bottle of heliox and found that once he had done that the feeling went away as fast as it had come�Investigation following the incident showed that very small leaks existed in both sleds. These were too tiny to permit an air leak, but sufficient to permit a small helium leak. Since these sleds were �topped off' following each dive rather than recharged, it was concluded that the slow helium loss eventually led to increased oxygen concentration to produce the symptoms described above. The solution was to attend to the valves, and to establish a procedure of completely emptying the bank prior to recharging." Stone, W. C., The Wakulla Springs Project, pg. 127-128, The U.S. Deep Caving Team, Gaithersburg, MD, 1989 -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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