A recurring statement on the recording is, "A person may start to experience hyperoxia or high levels of CO2 in their breathing." In fact, hyperoxia is too much O2 in the body's tissues and organs, leading to oxygen toxicity.
Cunningham (Gilly Gilchrist) is shown wearing a white shirt as part of his operational police uniform. Since 2013, Scotland has had a single national police service-Police Scotland-formed by merging all eight regional police forces. All operational officers across the country, regardless of rank, wear a standard black moisture-wicking T-shirt with "Police Scotland / Poileas Alba" on the sleeves. White shirts are only part of the formal dress uniform and are not worn during active duty.
Carl tells others that the bullet that hit him in the neck was not fatal because it was slowed down after it had hit his partner Hardy's spine first. But when Carl reviews the mock vidoes of the shooing it is clear that the bullet which hit Carl's neck had first hit Hardy's shoulder, not his spine. Then another bullet hit Hardy's spine.
A recurring statement on the recording is, "At five atmospheres, or 50 meters depth." This is incorrect. One atmosphere of pressure (ATM) is 10 m, so 50 m would add five ATM of pressure. But, sea level is 1 ATM, so 50 m would be 6 ATM. (Five ATM would be achieved at 40 m.)
Carl tells others that the bullet that hit him in the neck was not fatal because it was slowed down after it had hit his partner Hardy first. But any object (a bullet, a pencil, a speck of sand) passing through the neck is potentially lethal because it will result in bleeding that can drown the victim, or simply cause exsanguination (bleeding to death).