Airgapped exfil is a whole research field. Priority one is making accidental leaks or infections all but impossible. Priority two is making large scale intentio

Airgapped exfil is a whole research field. Priority one is making accidental leaks or infections all but impossible. Priority two is making large scale intentional leaks as slow and difficult as possible. As long as there are human eyes on the data, some level of leaking is possible.