Would it be possible to create a submarine, or some other structure,

It would be extremely painful.

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>>60034444
I meant to post this on /sci/, but it kind here as well I guess

Theoretically, yes.

In terms of current material technologies, it would likely be impractically small. Liquid metals that we can play with are already very dense. The more liquid you displace (as you'd need to with a large hollow-bodied vessel), the greater the force acting upon the hull. Resisting that much force becomes a bitch since surface area increases as the square of radius for something like a sub.

Yes, just make it of liquid diamonds.

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>>60034444
I heard that latest submarines from North Korea can submerge into liquid mercury.

Really depends on which metal. Big difference between lead and tungsten.

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What about molten rock?

>>60034539
Yeah. Once.

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>>60035021
What about bakelite?