Why do they drop fire into deep pits before going in? 🔥🤔

If fire goes out there’s no oxygen!☠️

Trapped gases

You aren't aware of fire and how oxygen, and it's lack thereof, affects it?

To burn H2S gas it is poisonous, causes death. it is heavy, so it settles at the bottom.

If you remember your school lesson about Davy’s lamp …

The flame goes out, carbon monoxide, danger of death. There is a flash flame, methane gas (tress), danger of death.

二酸化炭素の滞留を確認

現代ではガス検知器が主流ですが、発展途上地域や伝統的な現場では今でもこうした簡易的な方法が使われています。まさに「炭鉱のカナリア」的先駆的警告システムですね。

Is used to do this to a girl I fucked in HS before we had sex.

Để tiêu diệt virut và tạo điều kiện an toàn cho việc nhập cảnh.