Rigby5
Diamond Member
The bubbling they spotted is probably air. Natural gas doesn't "bubble".
Yes it does.
All gases "bubble".
![news.mit.edu](https://news.mit.edu/sites/default/files/images/201906/MIT-Bubble-Formation.jpg)
Researchers solve mystery of how gas bubbles form in liquid
MIT researchers have analyzed the way bubbles of air or gas form in a liquid, and found that when confined in a tube, this process is “universal,” meaning that it produces bubbles of uniform size and spacing regardless of the specific conditions.