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1 2 3  UER Forum > Archived Rookie Forum > what are some dangers of drainage tunnels besides rain? (Viewed 2170 times) etchleon  Location: toronto today... Gender: Male E Tenebris Lux  |  Re: what are some dangers of drainage tunnels besides rain? <Reply # 40 on 5/1/2011 1:39 PM >   40mm filter NSN 6640-01-500-7117 will provide at least 60 minutes protection from h2s (and things like VX, CS, Chlorine and anthrax too) Trained and fit persons can function at 12%...15000ft equivalent saturation, the standard O2 level used by mountaineers, including climbs up Everst. 10% one should still be conscious and able to function, albeit with some impairment, This was tested on random US service men. tl;dr you work with with around 1/2 sea level oxygen if your in decent shape. That shows on pulse oximeter as 60-72% blood o2 saturation...buy one, they're like 40 bucks. Then you can see your blood o2 levels if your worried. The worst hazard I encountered in a (sanitary) drain was an unexpected pool/drop off that was part of an uphill pumping station...lucky it was not running at the time or I'd be pumped too. srsly, watch out for pump stations, I have a feeling they make a rip tide seem like a swimming pool. UER Forum > Archived Rookie Forum > what are some dangers of drainage tunnels besides rain? (Viewed 2170 times)  1 2 3  All content and images copyright © 2002-2024 UER.CA and respective creators. Graphical Design by Crossfire. To contact webmaster, or click to email with problems or other questions about this site: UER CONTACT View Terms of Service | View Privacy Policy | Server colocation provided by Beanfield This page was generated for you in 140 milliseconds. Since June 23, 2002, a total of 741992006 pages have been generated.