There are, sadly, lots of reports of farmers and their family members dying in manure pits due to a buildup of CO2 and methane. Someone goes in first and passe

There are, sadly, lots of reports of farmers and their family members dying in manure pits due to a buildup of CO2 and methane. Someone goes in first and passes out, and then anyone else who tries to go in to save him suffers the same fate. In one case 5 members of a dairy farming family all died trying to save their father.