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Outdoor & Recreation
Safety and Survival
Dangers With Old Workings From Lifes "Experiences"
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<blockquote data-quote="mbasko" data-source="post: 289746" data-attributes="member: 4485"><p>Something else that is overlooked is the weather or more specifically the barometric pressure fluctuations associated with it.</p><p>In normal or high barometric pressure the weather is usually associated with fine or clear weather. In times of low barometric pressure it is associated with cloudy days, rain or storms. </p><p>Natural caves & unventilated man made underground voids such as tunnels & abandoned mines etc. "breath" with the fluctuations in the barometric pressure. In a normal surface atmosphere high pressure pushes good air into the void while low pressure draws the mine air out. Over normal daily fluctuations this is likened to breathing in & out.</p><p>What displaces this good air in low pressure conditions? In some mines it may just be more good air from elsewhere in the mine but in a lot of cases it can be displaced by bad air from deeper with the mine.</p><p>Storms can cause a rapid drop in the barometric pressure which will draw out air, either good or bad, from deeper within mines more rapidly. Some of these areas can hold the gases mentioned above or even damp. A sudden drop in barometric pressure can leach these gases or damp into areas that are otherwise usually good air. This can cause unexpected problems in otherwise usually "safe" caves or abandoned mines.</p></blockquote><p></p>
[QUOTE="mbasko, post: 289746, member: 4485"] Something else that is overlooked is the weather or more specifically the barometric pressure fluctuations associated with it. In normal or high barometric pressure the weather is usually associated with fine or clear weather. In times of low barometric pressure it is associated with cloudy days, rain or storms. Natural caves & unventilated man made underground voids such as tunnels & abandoned mines etc. "breath" with the fluctuations in the barometric pressure. In a normal surface atmosphere high pressure pushes good air into the void while low pressure draws the mine air out. Over normal daily fluctuations this is likened to breathing in & out. What displaces this good air in low pressure conditions? In some mines it may just be more good air from elsewhere in the mine but in a lot of cases it can be displaced by bad air from deeper with the mine. Storms can cause a rapid drop in the barometric pressure which will draw out air, either good or bad, from deeper within mines more rapidly. Some of these areas can hold the gases mentioned above or even damp. A sudden drop in barometric pressure can leach these gases or damp into areas that are otherwise usually good air. This can cause unexpected problems in otherwise usually "safe" caves or abandoned mines. [/QUOTE]
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Outdoor & Recreation
Safety and Survival
Dangers With Old Workings From Lifes "Experiences"
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