As for the safe, it's rated to keep the internal temp below a max 177 degrees celsius for 2 hours. Most importantly it keeps sealed for 24 hours, so if the fire brigade filled the house full of water it would still be ok.
I thought I read on their website that it was good for 20 minutes in a mere 8" of water? And that's not taking into account the fire burning away the water seals..
I think that's just if it hasn't just gone through a fire. When they go through a fire, there's sufficient thermal expansion of the fire safe to seal the box watertight, without water seals. Hence the 24-hours... that's how long it takes, once removed from the fire, for the box to shrink back into a state where it can be opened. At least, that's how our fire safe box is supposed to work.
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