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.
That makes sense different systems for different uses. Are there a lot of different types of scuba gear?
Yes, for example there are closed circuit and open circuit scuba systems. Closed systems allow you to recycle the air you exhale.
Interesting, I assume the open ones must use un-recycled air then