The air quality meter Rossi finds in the bunker indicates the oxygen level is 82.7%, this indicates that oxygen levels are 82.7% of normal, not that 82.7% of the air inside the bunker is oxygen, breathing air with that much oxygen would actually become toxic in a short period of time. Normal atmospheric composition is 78% nitrogen, 21% oxygen, 0.9% argon and the remaining 0.1% are gases like carbon dioxide, methane, water vapor, and neon. If the oxygen levels in the bunker are 82.7% of normal that would mean the oxygen level would be down to 17.36%. OSHA considers 19.5% oxygen to be the lowest acceptable level, below that the symptoms of hypoxia begin to set in. Rossi would be starting to feel the effects of hypoxia at 17.36% due to him being over the age of 70, different people have different tolerances to low oxygen depending on their age and overall health. Oxygen levels between 19.4% and 10% cause early hypoxic symptoms like increased breathing rate, accelerated heartbeat, impaired thinking and coordination. Levels between 9.9-6% will cause severe hypoxic symptoms like nausea, vomiting, lethargy and unconsciousness. When oxygen levels drop below 6% fatal hypoxia begins to set in causing convulsions, cessation of breathing and finally cardiac arrest, the exact oxygen level that causes death can vary anywhere between 6-1% depending on the aforementioned factors like age and health.
Garcia narrows down Rossi's location by checking to see where within the search area it is raining, but there is another thing that could be done to narrow it down even more. On the video, in addition to rain, thunder can be heard as well, the National Oceanic and Atmospheric Administration (NOAA) records the exact time and location of every lightning strike in the United States, this information is uploaded to both the NOAA website and their weather app within a minute of each lightning strike, if Garcia checked the locations of all lightning strikes within one minute of hearing the thunder that would narrow the location down so much more.
This episode was dedicated to Harry Bring. After fighting cancer for years, Bring died February 16, 2021 - less than a year after "Criminal Minds" ended on CBS. He was 77-years-old. Harry Bring - more often credited as Harry V. Bring - was a producer who worked on several well-known television shows, including "The X-Files" and "Army Wives." His biggest credit based on numbers, however, was "Criminal Minds." Bring served as either executive producer or co-executive producer on 186 episodes between 2011 and the series' original end in 2020. He also worked as an assistant director on such programs as "Melrose Place," "Northern Exposure," and "Max Headroom."