Trimix is a breathing gas consisting of oxygen, helium and nitrogen and is used in deep commercial diving, during the deep phase of dives carried out using technical diving techniques, and in advanced recreational diving.
Partial pressure gas blending equipment for scuba diving
Gas blending oxygen and helium analyser
CMAS-ISA Normoxic Trimix diver certification card
A breathing gas is a mixture of gaseous chemical elements and compounds used for respiration. Air is the most common and only natural breathing gas, but other mixtures of gases, or pure oxygen, are also used in breathing equipment and enclosed habitats. Oxygen is the essential component for any breathing gas. Breathing gases for hyperbaric use have been developed to improve on the performance of ordinary air by reducing the risk of decompression sickness, reducing the duration of decompression, reducing nitrogen narcosis or allowing safer deep diving.
Sailors check breathing devices at sea.
A closed bell used for saturation diving showing emergency gas supply cylinders
2% Heliox storage quad. 2% oxygen by volume is sufficient at pressures exceeding 90 msw.
Electro-galvanic fuel cell as used in a diving rebreather
