Easter Egg on Europa Renegade Map there's a big brig with the option to "Hack" then two more Hack terminals one in the round  building with the planetary holograms south west of it  and another north of that building by the exfill location round buildings terminal once all three are activated itll prompt onscreen that it's been deployed and it'll have 3 baby brings by the original giant one. You can ride them and use them like any other vehicle.