From: "Billy Brown" <bbrown@conemsco.com>
>IMO, the picture isn't that simple. Early nanotech won't be able
>to burrow that well - remember, there is nothing preventing us
>from using 100 MT warheads instead of the puny <200 KT devices
>currently in fashion. Later nanotech could do it, but by then
>you're facing multi-gigaton weapons. Mature nanotech could protect
>you from anything reasonable, but by then I would expect all
>threats to be pretty unreasonable. For a good level of security,
>you really need a good anti-missile system and enough room to use
>it.
Brian
Member, Extropy Institute
www.extropy.org