We did buy our first house...and it has a basement. I'm sure we can make a connection underground somewhere and add at that bomb shelter.
I was at a conference this past weekend and one attendee was telling me about a student who was doing research on 2012. She said she had a hard time finding reliable resources on this "conspiracy" but after reading the student's paper, she is now a believer too. I suggested she build a bomb shelter. :)