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There is one British scientist
who has been developing

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a humane method of killing based on the
euphoric effects of the altitude chamber.

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Dr Mohan Raj from Bristol University
has been researching hypoxia

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as a way to kill farm
animals in slaughterhouses,

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but instead of using a
multi-million pound machine,

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he's using a painless gas.

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You've been using hypoxia
humanely to kill farm animals.

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How are you doing that? We're
using argon and nitrogen.

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You're using a gas? Yes. And that produces
the same sort of hypoxia as I experienced?

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That's correct, principally
they deprive the brain of oxygen.

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And how have you been doing that?
We wanted to choose the gas mixture

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that is animal-welfare friendly.
The best way of deciding that

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is to ask the pigs if they
were given a free choice

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to choose one or the other gas,
what they call preference testing.

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Doctor Raj conducted an experiment
in which pigs were offered apples

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in a chamber filled with
different hypoxia-inducing gases.

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First, he used carbon dioxide, a
toxic gas that irritates the body.

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they will not feed
in that atmosphere.

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Then he used inert gases
such as nitrogen and argon.

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Unlike carbon dioxide and the
poison used in the gas chamber,

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inert gasses have no detectable
smell, taste or physical sensation.

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So the body has no way of knowing
that the oxygen in the air has been

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entirely replaced by another gas.

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The painless effect is confirmed
by what the pig did next.

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They woke up and just looked around

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and went back to feed again on the
apples, and that indicated to us

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that it is a stress-free
induction of unconsciousness.

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And can I see this
equipment? Of course you can.

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So simple!

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It is.

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We have a source of nitrogen here.

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Yeah. Taken through this tube,

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and the gas is delivered
using the face mask

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to pigs restrained in this hammock.

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And would you be able
to change this mask

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to a human mask and apply it to me?

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Yes, you could, but I
wouldn't recommend it.

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Why? Because if you're inhaling pure nitrogen,
you will be unconscious within 15 seconds.

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15 seconds, really? That's right.

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And how long to
death? Within a minute.

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Really? Yes. That's astonishing.

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So this really is the
perfect killing machine.

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That appears to be the case, yes.

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'So it turns out that a canister
of gas, a tube and a mask

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'can be the perfect killing
machine. It's as simple as that.'

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The method is cheap, it's
viable, it's infallible.

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Not only is it painless, but
the person dies with euphoria,

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and so science does provide

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the answer to how you can have
a humane method of execution.