To get an thought of what it is like inside an underwater submersible, we come to an industrial property within the Dutch city of Breda.

This is the house of U-Boat Worx, which makes a variety of submersibles.

Most of them are purchased by personal yacht homeowners to make use of for their very own initiatives, however a lot are used for analysis and exploration.

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None of them go as deep because the wreckage of the Titanic; they don't seem to be designed for these depths.

But in entrance of us is the Cruise Sub-7, a seven-person submersible that is bought roughly the identical dimensions because the lacking Titan vessel.

One distinction is straight away apparent. At the back and front of this machine is a big acrylic window that permits a large view of the surface world.

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The Titan is totally different, with a really restricted view by way of a single porthole.

I climb a flight of steps to succeed in the highest of the submersible, then go down 4 steps of a ladder into the sub itself.

Three issues strike you immediately - the sunshine that is available in by way of the home windows; the subtle instrument panel and the small dimension.

The mild may have gone even by the point you get to a depth of 300m (980ft) - it is darkish at that depth.

But the sub has highly effective exterior lights and that will ease the sense of claustrophobia.

On the Titan, you do not have that - it should really feel way more as in case you are trapped in a field.

The instrument panel is one other key distinction - the Titan, as everybody now is aware of, is partly manipulated by an outdated Playstation controller, and doesn't have worldwide security certification.

The Sub-7 is totally licensed, and has an array of controls for regular manoeuvres, emergency response and communications with the floor.

All of that gives reassurance. The record of "fail-safe guarantees" in case of issues is lengthy.

But then there's the scale.

You'd solely count on to remain on the Sub-7 for an hour or two - eight hours on the most - and I do not suppose you'd need to keep longer.

With seven individuals inside, it could really feel cramped.

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There is actually not sufficient house to face up straight and transferring round is tough.

The prospect of being trapped inside a submersible of this dimension for days on finish could be completely grim.

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