## What Depth Do You Need Mixed Gas for Scuba Diving?
Mixed gas scuba diving is a type of diving that uses a breathing gas that is a mixture of oxygen, nitrogen, and helium. This type of diving is typically used for deeper dives, where the pressure of the water can cause nitrogen narcosis.
Nitrogen narcosis is a condition that can occur when a diver breathes nitrogen at high pressure. Symptoms of nitrogen narcosis include confusion, euphoria, and impaired judgment. In severe cases, nitrogen narcosis can lead to unconsciousness and even death.
Mixed gas diving can help to prevent nitrogen narcosis by reducing the amount of nitrogen in the breathing gas. Helium is a gas that is less narcotic than nitrogen, so it can be used to replace some of the nitrogen in the breathing gas. This can help to reduce the risk of nitrogen narcosis, and it can also allow divers to dive deeper.
The depth at which a diver needs to use mixed gas depends on a number of factors, including the diver’s experience, the type of diving being done, and the water conditions. In general, however, divers should start using mixed gas at depths of around 100 feet (30 meters).
## Benefits of Mixed Gas Diving
There are a number of benefits to using mixed gas for scuba diving. These benefits include:
Reduced risk of nitrogen narcosis: Mixed gas diving can help to reduce the risk of nitrogen narcosis by reducing the amount of nitrogen in the breathing gas.
Deeper dives: Mixed gas diving can allow divers to dive deeper than they could with air. This is because mixed gas is less narcotic than air, so it can be used to reduce the risk of nitrogen narcosis.
Improved performance: Mixed gas diving can help to improve diver performance by reducing the amount of work that the diver has to do to breathe. This is because mixed gas is less dense than air, so it is easier to breathe.
## Risks of Mixed Gas Diving
There are also some risks associated with mixed gas diving. These risks include:
Oxygen toxicity: Oxygen toxicity can occur when a diver breathes oxygen at high partial pressure. Symptoms of oxygen toxicity include seizures, convulsions, and even death.
Helium tremors: Helium tremors are a type of tremor that can occur when a diver breathes helium at high pressure. Helium tremors are typically not dangerous, but they can be annoying.
Hypothermia: Mixed gas diving can increase the risk of hypothermia because helium is a gas that conducts heat away from the body. Divers who are using mixed gas should take steps to stay warm, such as wearing a drysuit or a thick wetsuit.
## Choosing a Mixed Gas
There are a number of different mixed gases that are available for scuba diving. The type of mixed gas that you choose will depend on the depth of the dive, the type of diving being done, and your personal preferences.
Some of the most common mixed gases include:
Nitrox: Nitrox is a mixture of oxygen and nitrogen. Nitrox is typically used for dives of up to 130 feet (40 meters).
Trimix: Trimix is a mixture of oxygen, nitrogen, and helium. Trimix is typically used for dives of up to 200 feet (60 meters).
Heliox: Heliox is a mixture of oxygen and helium. Heliox is typically used for dives of up to 300 feet (90 meters).
## Conclusion
Mixed gas diving can be a safe and enjoyable way to dive deeper and explore new underwater worlds. However, it is important to be aware of the risks associated with mixed gas diving and to take steps to mitigate those risks. By choosing the right mixed gas, following proper safety procedures, and getting proper training, you can enjoy the benefits of mixed gas diving without putting yourself at unnecessary risk.
## Additional Resources
[PADI Enriched Air Diver Course](https://www.padi.com/courses/enriched-air-diver)
[IANTD Mixed Gas Diver Course](https://www.iantd.com/courses/mixed-gas-diver)
[TDI Mixed Gas Diver Course](https://www.tdisdi.com/courses/mixed-gas-diver)