My wife and I like to go scuba diving underwater. We each use separate breathing devices.
Oh that sounds so exciting, I have never been scuba diving before? What kind of breathing devices do you use?
We use tanks that contain compressed air. This allows us to move freely underwater for long periods.
That is nice, so you can explore a bit easier, how long can you stay underwater with the tanks?
For a long time depending on how much gas you have. It really depends on your scuba system because there are different ones.