It might be a bit expensive, but how about something like this?<br><br>http://www.greenlee.textron.com/download/archive/287-291.pdf<br><br>Here in the northwest, they sell these at the Home Depot chain. Prices start at $150 for the little guys.<br><br>The good thing is they very sturdy and come built in with provisions to keep them closed and have things you could chain them up.<br><br>For example, put in garage, use chain to bolt it to the foundation and use a combo lock to keep it closed. Should still be there if the whole garage is gone. Make sure you have a pry bar around in case something heavy smashes it and you have to convince the lid to open.<br><br>-john