Workers Drilling in Romania Broke into a Cave Sealed for 5.5M Years

Just because the cave is sealed now, does not mean it has been sealed for millions of years. Even for geology, 5.5M years is a long time. I don't understand how they can claim it never had connections to the outside, just because it doesn't have connections now.

Does anyone have the original source of this information? This article seems to be AI generated: https://www.pangram.com/history/fdf6dfd6-1a9c-4267-a90c-a3cf...

Interesting that being sealed for 5 million years did not yield any life forms more complex than insects.

Maybe sun and space are importance factors for intelligence.

It's all fun and games until they run into another branch of homo sapiens ala the descent....

Great first line for a story.

> Oxygen levels run at roughly half of what our lungs expect. Carbon dioxide is present at concentrations enormously higher than in the outside atmosphere. The air is laced with hydrogen sulfide, the compound responsible for the smell of rotten eggs, and with methane and ammonia.

So it was not truly sealed. A truly sealed cave would have had no oxygen, it would have all been consumed in reactions with methane.