Thanks for your question Hartley. There is a briefing room in Parliament House with access to secure technology. The government can use this room to respond to emergency events, such as natural disasters, and local and international security incidents.
Interestingly, a bomb shelter was included in the original design for Parliament House. Plans for the shelter were abandoned after it was decided that it was too expensive. Instead, a large bunker in the basement of the building was set aside to convert to a bomb shelter in the future. However, the shelter has never been built.