Here's how it works:

* Electrolysis: Sodium chlorate is dissolved in water and then subjected to electrolysis. This process uses electricity to split the water molecules into their constituent elements: hydrogen and oxygen.

* Oxygen Production: The oxygen gas produced at the anode (positive electrode) is collected and purified.

* Byproduct: The hydrogen gas produced at the cathode (negative electrode) is usually vented or used as fuel in some systems.

This method is commonly used in modern submarines as it provides a reliable and efficient way to generate oxygen for the crew's breathing.