Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

#289,051
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#289,063
CRT2 said:

From DAN:​

The safest practice is to pay attention to the partial pressure and the amount of exposure time. To lower your risk of CNS oxygen toxicity, consider the following recommendations.

PREVENTION:
  • The U.S. Navy uses 1.3 ATA as the maximum limit in its closed-circuit rebreathers. Very long exposures, however, may put the diver at risk for some lung toxicity symptoms.
  • The National Oceanic and Atmospheric Administration (NOAA) recommends a more conservative 180 minutes at 1.3 ATA for normal exposures and 240 minutes only for exceptional exposures.
  • The Professional Association of Diving Instructors (PADI) has proposed a limit of 1.4 ATA for open-circuit nitrox scuba diving. Because open-circuit scuba diving would not expose divers to this level continuously, it should be at least as safe as the Navy limit for continuous exposures.
  • Shallow exposure times in the 1.3 to 1.4 ATA range are mainly to avoid lung oxygen toxicity. The likelihood of CNS toxicity at these levels is very low and probably not much different over this range.
  • The Navy allows an exercising exposure at 1.7 ATA for up to four hours, but that assumes breathing 100 percent oxygen at 25 feet (7.6 meters) by trained combat swimmers. A depth excursion of only 5 feet (1.5 meters) puts a diver in a range where convulsions have occurred. Divers who tend to retain carbon dioxide during exercise may be at increased risk.
  • The NOAA limit for nitrox diving at 1.6 ATA is 45 minutes for normal diving and 120 minutes for exceptional exposure diving.
  • Breathing 100 percent oxygen during a decompression stop at 20 feet (6.1 meters) is a common practice. At this depth, the partial pressure will be about 1.6 ATA. Under resting conditions at that depth, the chance of CNS oxygen toxicity should be very low but is not absent.

Oxygen Partial Pressure Ranges​

For open-circuit scuba, the “green light” region is any oxygen partial pressure of 1.4 ATA or less (about 82 feet or 25 meters on a 40 percent oxygen mix). If you don’t exceed this level, the other limitations of open-circuit scuba diving will limit your exposure time to lengths where CNS oxygen toxicity is unlikely.

Between 1.4 and 1.6 ATA (99 feet or 30 meters on a 40 percent mix) is the “yellow light” region. The possibility of oxygen toxicity at 1.6 ATA is low, but the margin of error is very slim compared to 1.4 ATA. Individual variation, an unplanned depth excursion that causes an increase in oxygen partial pressure, and the possibility of having to perform strenuous exercise in an emergency raise the possibility of oxygen toxicity to levels where you should exercise caution. Levels of 1.5 to 1.6 ATA should be only for conditions where you are entirely at rest, such as during decompression. The dive team must still prepare for the possibility of an oxygen convulsion at these levels.

Above 1.6 ATA is the “red light” area. Recreational divers should not exceed this level. Even mild exercise may put divers breathing high-density nitrox mixes at increased risk. Open-circuit scuba divers can achieve durations likely to get them into trouble at these levels. Diving using these high partial pressures of oxygen should be for trained professionals who can weigh the risks and benefits and have the necessary training and support structure in place if an oxygen convulsion occurs.
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#289,084
clcustom1911 said:
Gotta get that SIGINT for the targeting folks to figure out.

View attachment 8621004

Not gonna lie, I absolutely can't wait until we actually put the fear of God into those heathens while they worship their false idols and narco saints.
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I want nothing more that to kill all of them.

But I don’t want any boots on the ground.

Finish the wall and let it go mad max, let them clean up their own mess line El Salvador did.

We’re going to have some tier 1 guys get smoked because of ROE, and the entire town is cartel. They took on the Mexican military and actually dropped a helicopter. This isn’t 3 dirty guys in sandles in the sand. These are highly populated areas.
 
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#289,089
@Barneybdb @Dirty D and @Threadcutter308 aren’t allowed to go to get togethers anymore after this.
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816K views · 71K reactions | It's a big deal.... Loudermilk 👨‍🚀 #instagramreels #instagram #instagood #instalike #reelsinstagram #reelsvideo #reels #funnyclips #funnymemes #funny #funnyvideos | The Floating Space Man ©️

It's a big deal.... Loudermilk 👨‍🚀 #instagramreels #instagram #instagood #instalike #reelsinstagram #reelsvideo #reels #funnyclips #funnymemes #funny #funnyvideos.
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#289,096
Fx51LP308 said:
If you follow all the rules, if you train properly, if you keep your equipment properly maintained and (most importantly) if you keep your ego/attitude in check at all times (i.e. don't do dives beyond your training/experience), you should be able to go home at EOD. It's that last part where which most "dead divers" have issues. I can cave dive as deep as 130ft and Open Water dive as deep as 150 ft, but no deeper for either unless/until I complete my mixed gas training. This is where you learn to dive with gas mixes that are less than 21% O2 (i.e. the % or "fraction of O2" (FO2) in the mix). And. mostly, you substitute that with Helium. So, the basic "Tri-mix" course trains you on 18% FO2, 35% Helium and the rest, compressed air. And that should get you down to about 218ft. There is also an "Advanced Tri-mix" course, where you use 10% FO2, 70% Helium and the rest as air. And that can get you closer to 300ft in depth, but only for a short time (like 9 min.). But you must also carry all the other mixes with you and change to/from a given mix as you descend and re-ascend. That 10-70 mix should be your main bottom mix. So, you have all these spare bottles with you. And, at certain depths, you switch to the next bottle and leave the one you were using at that depth for when you return to it on your "deco" schedule. But it all has to do with how your tissues absorb O2 and at what "partial pressure." Too much O2 at deeper depths can actually kill you as PP02 can be much greater than your tissues can absorb. You die from Oxygen Toxicity. Remember, as you dive deeper, the overall pressure on your body increases, thus increasing the PPO2 to your tissues. That's why 10% FO2 works at very deep depths but also why you should never breathe it unless you are at those depths. On the surface, you could get away with only 18% FO2 if you had to. Thankfully, it's more like 21% in regular air.


Trivia quiz: How deep can you go down on breathing pure 100% O2?
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To the bottom.
 
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