The main reason the hydrogen-powered submarines are a tough sell is that the engines are bulky and require extensive modifications to keep them working.

They’re also extremely costly, with the most recent model costing $4.6 billion to build.

But, for all that, they can be built cheaply, with a relatively simple process.

To make them, hydrogen is produced from water in the oceans.

The water is captured by a high-pressure tank, heated, and then stored.

The hydrogen is then released at high pressure to generate steam.

When the tank is filled with water, a large amount of it can be pumped back out and heated.

The process takes place in a small room with a turbine and an electric motor.

This engine is then connected to a generator that turns the steam into electricity.

This generates a generator, and the process continues.

The only part that isn’t made of hydrogen is the turbine.

A lot of the work is done by the ship’s engineer.

But if you want to build a submarine, you’re not going to need the engineer’s expertise, either.

You’re going to have to build your own.

A hydrogen-power submarine engine is about the size of a standard diesel engine.

A normal diesel engine, for example, uses a lot of water and can be expensive.

A typical submarine uses about 30 gallons of water to power its motors, which are powered by the same amount of water.

But when you combine that with a generator to convert that water into electricity, you have a fairly large amount to work with.

To build a hydrogen-based submarine engine, you need to figure out how to make the water and the electricity together.

The most obvious way to do this is to use a turbine, which is essentially a steam turbine that spins a piston, which in turn spins a turbine.

This works pretty well, because the water can be heated up and then pumped back into the engine.

But it’s still not perfect.

The turbine needs to be large enough to pump enough water into the turbine to produce enough steam to power the motors, and it needs to have a high speed to keep it spinning.

There are two problems with this.

First, the turbine needs a large area of the engine to be able to pump water.

This means that the turbine will only work if the water is pumped out of the way.

The second problem is that if you’re using a large turbine, you can get it to spin faster than the turbine can pump water out of it.

The bigger the turbine, the more water the turbine is going to pump out.

To fix this, you will need to add a turbine to the engine, or at least a larger part of the turbine so that it can pump more water out.

You also have to have the right amount of fuel in the engine so that you can turn it on and off, and you’ll also have a turbine that can rotate around the engine’s rotor to keep the water flowing.

A number of companies have been making hydrogen-fueled submarines for years.

One of the big advantages of hydrogen-fuels is that they’re so small that you could fit one on the end of your arm.

Hydrogen-fuel submarines are small enough that they can fit on a person’s arm, or maybe a couple on a small boat, and they’re relatively easy to build, with just a few hours of work.

To start with, you’ll need to build the engine yourself.

The engine itself will be a turbine of some kind, with some sort of control box in the middle.

You’ll also need a generator.

And, of course, you must have enough water to make enough water for the water to pump into the turbines.

To be able for the turbines to pump more than the water, you first have to convert the water into hydrogen.

There’s no way around this.

Hydrogens are a strange molecule.

They exist in two forms.

Hydroxide, or hydrogen sulfide, and Hydrogen.

Hydrates are water molecules, and hydrogen is an energy source.

You need hydrogen to make hydrogen sulfides, and if you put too much hydrogen into the tank, the tank can become full and you lose some of your fuel.

You can also make hydrogen with oxygen and hydrogen, which can create hydrogen sulfates, which you can then use to make more hydrogen sulfate.

Hydric acid, which happens to be what you’re looking for in a hydrogen fuel, is a simple compound of carbon and hydrogen.

The carbon, hydrogen, and oxygen are arranged in a ring around the ring, which means that if it’s compressed, the ring can compress.

So, you put in a lot more pressure, and as you compress the ring more and more, the pressure increases.

The pressure is then turned up, and this turns the ring even further, pushing more hydrogen into it, until the pressure is enough to cause the hydrogen to explode and split into hydrogen and oxygen