Final answer:
Technical divers commonly use mixed gases such as heliox and trimix for their dives. Heliox is a combination of helium and oxygen, which has a lower density and lower toxicity compared to other gas mixtures. Trimix consists of helium, nitrogen, and oxygen and is used for deeper dives to reduce the risk of nitrogen narcosis.
Step-by-step explanation:
Technical divers commonly use mixed gases for their dives. The most common mixture used is a combination of helium and oxygen, known as heliox. Heliox is used because it has a lower density and lower toxicity compared to other gas mixtures. By breathing heliox, technical divers can safely reach greater depths without experiencing issues such as nitrogen narcosis and oxygen toxicity.
Another mixture that technical divers may use is trimix, which consists of helium, nitrogen, and oxygen. Trimix is typically used for deeper dives where the partial pressure of nitrogen needs to be reduced to prevent nitrogen narcosis. The specific ratio of helium, nitrogen, and oxygen in trimix can vary depending on the depth and dive plan.