Seeing Mayumi's relay on the underground tunnel below the ocean.

Sounds like Mr Musk is planning something.

 

Yes. It's a good idea.

 

But it's also absolutely possible to let the ships pass through the bridge I designed

by leaving gaps between its length, and raising it high enough above the sea level,

so for the ships to pass through.

 

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It will be susceptible to the weather, however, like GPT says, since it is visible, it is

easy for maintenance.

One seismic activity for the underwater tunnel, I don't think it's easy to fix that.

Better to create a new one.

 

But bridge will be permanence... Easy to fix.....

And symbolic, since it's aiming at peace between two nations, whichever that will be.

Visibility is a symbol.

 

But then, there are the cost issues. Since the depth of the water is deep.

But if to produce the materials required, (mostly cement and iron) from scratch,

by buying the mines and processing them... The volume may be covered in a more cost-effective way.

 

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If also using Quantum Lock trains, underwater tunnels will not likely be probable,

due to the maintenance that is required per certain distance from time to time.

It should be easily accessible from the outside as well as inside.

 

And then, the heavy resource that could be transferred would be by trains.

(Not quantum lock trains but normal trains, quantum lock trains would be for passengers,

for its speed)

And underwater tunnels may not be perfect for that.

It would be perfect for trucks, however...

 

 

Well that is my argument. Reality may differ.

 

Tunnels are.... but especially underwater tunnels,

it probably has some limitations in diameter.

 

So i'm guessing when Mr Musk suggests this, this is for passenger vehicles.

 

One seismic activity will not survive the passengers, haha.

So I think it has less flexibility...

But it is optimal for certain places....

 

 

It also gives me another idea for underground tunnels,

based on my previous suggestion to create underground bunkers,

and my attempts to create tunnels in Mars.

 

Let me try.

 

 

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Ok, just drawn 2 diagrams in MS paint.

 

Diagram 1, simply suggests, as I have done with the underground bunker for the cryonics facility as protection, if you remember Mr Musk, and also for Mars following vertical tunnels, dig into making of tunnels diagonally to smooth into angles. But that is probably how it is done in the first place. I am uncertain. Just suggesting in case if not.

Diagram 2, which is also what I suggested for Mars, a giant digging tool to befit the diameter of the hole that is to be made, i've seen the dig 'heads' (3 or 4 circles protruding in an angle) rotating altogether to dig. So making a giant version of that is example 1.

And once the dig is done to an certain extent, length, you want to prevent this from collapsing into itself. So it would need to be stabilized from within, by shielding the surroundings with something solid.

(Which is basic principles I used in backyard geothermal energy vetical dig to prevent the dirt from collapsing into itself)

So in Example 2, is the grey area. Which would be panels to use as a shield. This would protrude from the machine in 4 sides. Touching the surface area of the diameter of the tunnel.

AND THEN,

in Example 3, is another protruding layer below it, which is in black in the diagram,
protrudes to reach the first layer of the panel (the grey) and a robotic arm that can follow the rotation WELDS the both together to create a solid foundation for it to prevent from collapsing  and ADDING whatever is required for more later on, to make it a full tunnel.

If both are too expensive, as they are metals, which is a lot of surface area to cover, they can be like honeycombs, holes everywhere, so to still keep the structural integrity but reduce the volume it takes to create it. These panels can be pre-designed in such a way that complete coverage of the tunnel by next layers can be attached to it in ease. And perhaps not metal, but something cheaper, and by design adding to structural integrity if a cement layer is to be laced on to it by a spray or something like that.

Which then would be an extremely fast build. And possibly cost-effective.