Then can, yes, but should they eh? is that not the nature of a 'bug'? feels a bit odd- probe being underground, and if it does see you, it will race through that ground to summon the hoarde. I feel like you're supposed to get a chance to snipe it instead of fighting the aliens.Well technically, they can spawn anywhere on the surface and space biome in the outer two-thirds, and you're still at the surface according to your depth meter.