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This is right.
Water or metal, take your pick: both massively-outperform air.
Wikipedia often has speed-of-sound for elements, iirc...
...
glancing at this, now I think that hexagonal-diamond would be most-efficient & fastest...
https://en.m.wikipedia.org/wiki/Speeds_of_sound_of_the_elements
Hexagonal-diamond is diamond, but with the carbon links in a different pattern.
Apparently you make it either 1 of 2 ways:
either alternate the orientation of layers of graphene, before compressing ( with explosives ) into diamond,
or you put carbon into a meteor, & crash it into a planet or something.
IOW, it forms about 60x as quick as normal-diamond, and takes insane pressure to do it.
Normal diamond would probably be next on the scale.
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