befree
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- Mar 22, 2022
- 2,587
SCUBA inert gas megathread
This thread was made only for the SCUBA method.
For other inert gas methods please use the other threads.
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Since my post regarding the SCUBA method in another thread, there have been many questions regarding this method
in several threads and by PM. That´s why I made this megathread.
For some people this method may sound complicated, but it´s not. Basically, it is nothing more than using diving equipment
by replacing a diving gas cylinder with an inert gas cylinder by using an adapter.
In addition to using the rubber mask version, I would like to introduce another, more comfortable version of this method.
Both versions have been successfully used for suicide. Which version you prefer is your decision.
This thread was made only for the SCUBA method.
For other inert gas methods please use the other threads.
************
Since my post regarding the SCUBA method in another thread, there have been many questions regarding this method
in several threads and by PM. That´s why I made this megathread.
For some people this method may sound complicated, but it´s not. Basically, it is nothing more than using diving equipment
by replacing a diving gas cylinder with an inert gas cylinder by using an adapter.
In addition to using the rubber mask version, I would like to introduce another, more comfortable version of this method.
Both versions have been successfully used for suicide. Which version you prefer is your decision.
Guide for the rubber mask
Required equipment
- 5 liters helium or nitrogen with a purity of at least 2.8 (99,8%) or higher
- cylinder adapter for connection to the regulator
- full face rubber diving mask (sold with the brand names Poseidon and Pegasus)
- diving regulator consisting of pressure reducer = 1st stage, hose and mouthpiece = 2nd stage (e.g. Cressi MC9 compact, as shown in the photos)
Advantages of this method
No shortness of breath and no feeling of suffocation, as CO2 continues to be exhaled.
Inhalation of pure helium or nitrogen that is not enriched by exhaled breathing air (with oxygen and CO2).
No risk of failure due to uncontrolled movements during unconsciousness or slackening of the muscles and a resulting change in body position.
Helium and nitrogen are odorless and tasteless.
No danger to other persons due to escaping gas.
Unconsciousness occurs very quickly (only a few breaths).
Death occurs after approximately 3-5 minutes in painless unconsciousness.
Technical explanation
The pressure in a full 5 liters helium or nitrogen cylinder is approx. 200 bar.
The pressure reducer, which is connected to the gas cylinder, reduces the inhaled gas down to 9 bar.
The second part of the regulator, the mouthpiece, regulates the pressure further down. This allows you to breathe normally.
These pressure adjustments are automatic and do not require manual control.
The mouthpiece operates according to breathing demand. This means that gas only flows when breathing in. If there is no inhalation or exhalation
at all, the gas flow stops automatically and the exhaled breathing gas is led out of the 2nd stage of the regulator (mouthpiece) via a membrane.
As a result, the exhaled gases (CO2 + O2) are never mixed with the gas to be inhaled. This also reduces the amount of gas required, because gas does not flow permanently.
To connect the regulators pressure reducer to the helium or nitrogen cylinder, you need an adapter. The type of adapter depends on the gas used but also on the country.
Before you order the adapter, you have to decide which gas you want to use.
Adapters for EU and some other European countries (not for the UK):
adapter for helium:
diving cylinder G 5/8" internal thread - helium W21.8 internal thread
adapter for nitrogen:
diving cylinder G 5/8" internal thread – nitrogen W24 internal thread
Procedure
First connect the adapter tightly to the cylinder.
After that connect the pressure regulator tightly to the adapter.
To check if the pressure regulator is properly connected to the cylinder, press the button in the center of the 2nd stage while opening the cylinder. You will hear gas coming out of the mouthpiece. Then release the button. Check if you hear gas coming out of the adapter or pressure reducer.
If not, everything is ok.
Caution ! Never open the cylinder without the pressure reducer (1st stage) being connected to the cylinder !
Due to the high pressure, the cylinder could empty quickly or the remaining amount of gas might not be enough.
- If you don´t want to proceed now, press the button in the center of the 2nd stage again and close the cylinder tightly. Release the button.
- If you want to proceed follow these steps:
Try on the mask without the mouthpiece/2nd stage. If necessary, adjust the straps precisely. Check that the mask fits airtight by covering the mouth opening with your hand and inhale. If the mask sucks against the face, it is airtight.
Take off the mask.
Insert the breathing part with the mouthpiece into the mouth opening of the mask.
Sit down in a comfortable, safe position.
The following steps must be done quickly:
Take a deep breath and hold it.
Quickly put on the mask with the breathing part and put the mouthpiece in your mouth.
Continue breathing normally. You will be unconscious after a few breaths.
Another author of a smilar guide recommends to remove the mouthpiece. I don´t agree with this.
If you become unconscious, you could close your mouth. Nasal breathing is difficult with this mask. However, with the mouthpiece in the mouth,
you can still breathe.
Improved version
Instead of the rubber mask and the regulator consisting of 1st and 2nd stage, you use:
- OceanReef full face mask Neptune III (or Neptune III Basic) or OceanReef Neptune Space G.divers each with integrated 2nd stage
- OceanReef Neptune 1st stage SL-35/TX regulator consisting of 1st stage, hose and connector
- and the right adapter for the inert gas cylinder in your country
For both versions important to know: There are regulators with a DIN and INT connection 1st stage !
Usually in every EU country you can order an inert gas cylinder and adapter on the website of the dealers. Only in Switzerland, Austria and the UK it´s a bit more difficult but possible. Start with the gas cylinder and adapter first before buying the other equipment.
This guide is for your information only. I do not encourage you to use this guide and this method. You act on your own responsibility.
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I generally don't recommend posting sources for inert gas or adapters on the forum anymore, because the authorities who read this forum might inform the dealers that their address is being shared on a suicide forum. The same thing could happen as with SN or N sources.
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