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You won't be dropping dead immediately. It's true that the due to poorly ventilated shafts inside mines breathing problems can occur. Mining personnel call this blackdamp. This is an asphyxiant, decreasing the available oxygen content of air to a level incapable of sustaining human or animal life. It's not only CO2 but a mixture of nitrogen, CO2 and water vapor.
The explanation that the guy was saved because he was at higher altitude is also bogus. It's true that CO2 is heavier than O2. If you ever filled a balloon with pure CO2 you will notice it will start to fall to the ground immediately So why doesn't the CO2 in the air sink and suffocate us? This is somewhat harder to explain. A visual might help:
Due to kinetic energy, there will be no significant "unmixing"
of the gasses. Even if the air were completely and perfectly still, the carbon dioxide would not form a pool on the surface. There is a dynamic equilibrium set up between gravitation, the tendency for the denser material to go down and diffusion the tendency for a material not to concentrate in one place, but to spread itself out. Nature is great.
They got the science wrong. TV producers don't have time for proper research. What a surprise. Other than that those "annoying" inaccuracies the episode was entertaining. Gislef described it aptly: "It wasn't great TV, but it was entertaining TV." Thank you for providing us with the reviews.