very good fly77. great ... that's almost a game ..
Have you tried to make a hole in the ground of outerra with any excavator? 
Not yet..but since I think it possible to deform the terrain in realtime via the excavator model script ( somewhere there was a "level terrain under object" command if I remember well.....yep
///Level terrain under object
//@param ext extra space from the floor rectangle [m]
//@param border border width [m]
//@param transition width of transitional area to the surrounding terrain [m]
//@param type surface type, temporary: 0 original, 1 gravel, 5|9 road, 7 dirt, 10|11 concrete
//@return true if successfull, false if terrain map not available
bool level_terrain( float ext, float border, float transition, int type );
)
it should be possible to do something....here rapid a mock-up of what it
probably could look like
otherwise ...
^ Explosion Excavator! 
yep...use
explosive excavator using the "create crater" command!
