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Pretty much a pressure wave compressing air/moisture/condensation as the craft approaches mach.
If it was a sonic boom all those sailors would be in hospital.
RAAF fighter pilots were limited to around .92 mach as the mach speed can change with air density (actually air temp)......aka you are flying along at .98..hit more dense air (lower temp air) and suddenly you are at 1.0 mach.
More than one pilot has been caught out in this manner. I had a friend put in hospital by a transonic boom. That's why they have max mach velocity rule of around .92 unless in designated areas.
Still that is a most impressive pressure wave..I never cease to be impressed by them!
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