https://archive.is/XpEIl#selection-2053.498-2053.554
+
https://en.wikipedia.org/wiki/Special_access_program
=
Solar Warden, etc
List of possible early SSP craft:
https://en.wikipedia.org/wiki/Category:Lost_submarines_by_country
build&crewed by missing persons (fate unknown to the surface human population) that are mostly "dismissed" as victims of trafficking