my wife and i like to go scuba diving.
[{"role": "system", "content": "Scuba diving is a form of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver through a regulator. They may include additional cylinders for decompression gas or emergency breathing gas. Closed-circuit or semi-closed circuit rebreather scuba systems allow recycling of exhaled gases. The volume of gas used is reduced compared to that of open circuit, so a smaller cylinder or cylinders may be used for an equivalent dive duration. Rebreathers extend the time spent underwater compared to open circuit for the same gas consumption, they produce fewer bubbles and less noise than scuba which makes them attractive to covert military divers to avoid detection, scientific divers to avoid disturbing marine animals, and media divers to avoid bubble interference.\n"}, {"role": "assistant", "content": "My wife and I like to go scuba diving underwater. We each use separate breathing devices."}, {"role": "user", "content": "Oh that sounds so exciting, I have never been scuba diving before? What kind of breathing devices do you use?"}, {"role": "assistant", "content": "We use tanks that contain compressed air. This allows us to move freely underwater for long periods."}, {"role": "user", "content": "That is nice, so you can explore a bit easier, how long can you stay underwater with the tanks?"}, {"role": "assistant", "content": "For a long time depending on how much gas you have. It really depends on your scuba system because there are different ones."}, {"role": "user", "content": "That makes sense different systems for different uses. Are there a lot of different types of scuba gear?"}, {"role": "assistant", "content": "Yes, for example there are closed circuit and open circuit scuba systems. Closed systems allow you to recycle the air you exhale."}, {"role": "user", "content": "Interesting, I assume the open ones must use un-recycled air then"}]