from Dave Georgeson on AGN interview
Basically, if it�s important, it�s destroyable. Well, that�s not quite true; you can�t destroy control consoles because we don�t want you to be able to blow up your own control console to defend your own base. But other than that, equipment terminals, medical terminals, manned turrets, basically everything you can interface with can be blown up, except control consoles and the silos; those are the only things you can�t destroy.
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This means that spawn tubes are destroyable.
Actually, I remember Smoke posting about spawn camping awhile back, and he said that you can. So, both of those, plus blowing the generator. Plenty of options.