So the main tank, the main critical thing, is this oxygen gas supply cylinder we have here.

But, if we only had an oxygen gas supply cylinder we wouldn't be able to go very deep, because we'd run into oxygen toxicity very, very quickly.

We also have a second oxygen cylinder, that's solely as a back up in case there's a problem with our first oxygen supply we can continue to breathe.

He turned the wrong valve when he filled his cylinder he had 80 percent oxygen in his tank when he should have had 40.

Cyrus cylinder guarantor of the Shah.

The first limitation is the oxygen oxygen toxicity.

Each cylinder is a parfait of time.

And another story of the cylinder begins.

They want to borrow the Cyrus cylinder.

And currently we're working on oxygen oxygen delivery on site.

Liquid oxygen

The piston does not come into contact with the cylinder cover.

Love is like oxygen.

Oxygen and hydrogen make water.

What happened next was remarkable, and it's where our cylinder enters the story.

And last year, the Cyrus cylinder went to Tehran for the second time.

The identifiers have mainly been used by customs officers to verify cylinder contents.

The primary purpose of the gas system is to provide oxygen, to replenish the oxygen that your body consumes.

When he has his great celebrations in Persepolis, he summons the cylinder and the cylinder is lent by the British Museum, goes to Tehran, and is part of those great celebrations of the Pahlavi dynasty.

Photosynthesis is modulated by oxygen, and we have an oxygen insensitive hydrogenase that we think will totally change this process.

It's called a carbon oxygen dwarf.

She tripped over her oxygen tank.

Water consists of hydrogen and oxygen.

Because the cylinder account and the Hebrew Bible account differ in one key respect.

40 years on and we're in 1917, and the cylinder enters a different world.

So, in this room, there's 20 percent oxygen or so, and if we reduce the oxygen concentration, we will all be dead.

And because you can't bind the oxygen, maybe you wouldn't consume it, and then maybe it would reduce your demand for oxygen.

And usually we'll have a slightly larger cylinder mounted exterior on the rebreather, like this.

The Babylonian cylinder is written by the priests of the great god of Bablyon, Marduk.

It inhales oxygen, just like we do.

We had lost seven tons of oxygen.

Stromatolites were the first to exhale oxygen.

It grew as light and oxygen increased.

Its oxygen consumption rate fell by tenfold.

I have an oxygen hose connected here.

The oxygen tanks didn't quite work right.

So someone came up with a very clever idea, to instead of heating the whole cylinder and cooling the whole cylinder, what about if you put a displacer inside a little thing that shuttles the air back and forth.

It's just a small cylinder down here which holds the generator inside and all the linkage and it's the hot cap the hot cylinder on the top this part gets hot, this part is cool, and electricity comes out.

(c) Research on oxygen hydrogen rocket engine components

You get a hypoxia, or a lower oxygen.

Oxygen, hydrogen and zinc have their own signature.

I was so fascinated by that Oxygen commercial.

It's not hard it's just three oxygen atoms.

There's a built in oxygen concentrator down there.

Because of the movement I was wasting oxygen.