Emergency situation

[AKA]

if I understand, you are asking what happens in Real Life with no ground coms?

In the real world, the pilot would turn the transponder to 7600 (this is the code for no communications) then fly to the nearest appropriate
airfield and circle the airport while looking for light gun signals from the control tower.

Blinking green means cleared to land. Blinking red means go away, airport is not safe for landing. Steady red means not cleared to land,
keep circling the airfield, and finally alternating red and green flashes means proceed, but with extreme caution.

I THINK that's right, I may be off on exactly which light gun signals mean what, a google search could tell you more.