Are the world's most powerful supercomputers operating in secret?

A supercomputer called Frontier has been officially crowned as the world's first exascale computer – one capable of a billion billion operations per second – but more powerful machines may be out there

Are the world's most powerful supercomputers operating in secret?
A supercomputer called Frontier has been officially crowned as the world's first exascale computer – one capable of a billion billion operations per second – but more powerful machines may be out there