How long can you dive with Trimix?
For PADI, they are Tec Trimix 65 (213 feet/65 m) and Tec Trimix. The course dives to a maximum of 295 feet/90 m, although certification is ‘unlimited’.
How deep can you dive with heliox?
Heliox, a mixture of helium and oxygen, for example, 50% oxygen with balance gas helium, allows professional divers to work at greater depths, up to 150 metres, for vital inspection, repair and construction work associated with the offshore oil industry. Heliox can avoid nitrogen narcosis at these depths.
What is Trimix used for in diving?
Trimix diving helps to reduce exposure to high oxygen partial pressures. Beyond 65 m/213 ft, oxygen reaches too high a partial pressure and becomes toxic to the central nervous system. To reach these depths, tech divers increase the quantity of helium in the mixture and reduce the percentage of oxygen.
At what depth does oxygen become toxic?
Oxygen toxicity occurs in most people when the partial pressure of oxygen reaches 1.4 atmospheres or greater, equivalent to slightly over 187 feet (57 meters) depth when breathing air (shallower depths when breathing oxygen concentrations greater than 20%).
Why do deep sea divers breathe helium?
In some dives, both nitrogen and oxygen can induce a state similar to drunkenness. Adding helium to the mix reduces this so divers can think more clearly. Using helium can also mean divers can take fewer stops on their return to the surface, without suffering decompression sickness.
How is trimix calculated?
fraction of gas × (depth/33 + 1) So the equivalent narcotic depth can be calculated as follows: partial pressure of narcotic gases in air at END = partial pressure of narcotic gases in trimix at a given depth.
Why do divers use nitrogen?
When you scuba dive, the longer you stay under the water (bottom time), the more nitrogen your body absorbs. If divers absorb too much nitrogen in their blood stream, they develop a condition known as “the bends” (also known as decompression sickness). … This is common and part of the diving experience.
What is normoxic Trimix?
Normoxic Trimix is that in which the oxygen concentration is at least 18 percent. This eliminates the risks associated with hypoxic gas mixtures, which require the use of a travel gas in shallow water. You can use Normoxic Trimix as deep as 60 m/200 ft without exceeding a PO2 of 1.4 ATA.
Can you fart while diving?
Farting is possible while scuba diving but not advisable because: … An underwater fart will shoot you up to the surface like a missile which can cause decompression sickness. The acoustic wave of the underwater fart explosion can disorient your fellow divers.
What happens to a human body at crush depth?
Since your body’s internal pressure is so much less than the ambient pressure, your lungs would not have the strength to push back against the water pressure. At a deep enough level, the lungs would collapse completely, killing you instantly.