fgfs --airport=EGLL --aircraft=ufo

...puts you in a mysterious place with thick fog, where ground level is
about 6 million m below sea level. This must be the airport of Hell.

While trying to investigate this, I found the following peculiar logic in
FDM/groundcache.cxx, line 364:

        if (0 < sgdScalarProductVec3( off, down ) || !found_ground) {
                  found_ground = true;

Which reads "if ground is not found, then ground must be found". ?:-P

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