Room-temperature superconductivity has finally been demonstrated, as reported by Quanta (and others), with the caveat that it requires compression of the substrate at nearly 2 Mbar. Obviously, this is an impractically high pressure, but if a different material were found that only required a much lower pressure, would it be feasible to manufacture wires under compression? If so, what is the current state of the art? I have not been able to find any examples of such a product. Most apropos to chemistry, what is a practical upper-bound on tension/compression we can expect from currently known materials?
A trivial example would be to put a spring in a box, which only requires compressing the spring and sliding it into a box. For the wire, one could perhaps imagine a strange "cylindrical press" (not sure if there is such a device) and a jacketing material with extremely high tensile strength into which the wire is thus threaded (or, more likely, the jacket is somehow rolled onto it).
A more sophisticated system would be a compressive jacket which is applied in a relaxed state, possibly at high temperature, and then cools/shrinks into a high-tension state which applies the necessary compression.