I'd say that fiberglass is the best. FEMA even recommends using fiberglass storm shelters because they provide the best protection even from tornadoes. Aside from the superior protection, they are also comfortable and durable.
Indoors.
Shelter from the Storm was created on 1975-01-17.
what web site to apply for a government grant for a storm shelter
What do I need to do to get a free Grant for a storm Shelter?
Need application for a FEMA grant for a tornado storm shelter
The safest place in a tornado is a basement or underground storm shelter. If no underground shelter is available the best shelter is a central room away from windows on the lowest story of a house.
Tornado
shelter from the storm
The cast of Shelter from the Storm - 2010 includes: Adedotun Adekeye Jany Diogo as Juliet James Fahy
under an antenna tower
8
My Date - 2009 Shelter from the Storm 1-9 was released on: USA: 25 May 2009