Why Can't Scuba Kits Be Filled with Only Oxygen?

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Scuba diving equipment utilizes a mixture of gases, primarily oxygen, nitrogen, and sometimes helium, due to the effects of pressure and gas solubility at depth. As divers descend, the solubility of gases in the blood increases, which can lead to oxygen toxicity if the breathing gas is composed solely of oxygen. High concentrations of oxygen can cause harmful physiological effects, including seizures and lung damage. Nitrogen, while it can contribute to joint pain through decompression sickness, is included in the mixture to balance the oxygen levels and mitigate the risks associated with high-pressure environments. Helium is sometimes used to reduce the risk of nitrogen narcosis and improve breathing efficiency at greater depths. Therefore, a mixture of gases is essential for safe diving practices.
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I read in my textbook that Scuba kit has mixture of air such as nitrogen hydrogen and oxygen sometimes even helium is used instead of nitrogen. As pressure increases going deep in oceans, solubility of gas in liquid increases. So oxygen starts to dissolve quickly. But I don't understand why other gases are being used. Why can't scuba kit be filled completely of oxygen? I think it can stop joint pain as nitrogen will not be present. Any reasons why it isn't completely filled with oxygen but mixture of gases are used? Please help me
 
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