No. My FlatSafe "could" flood. There is nothing to stop liquid from flowing in. If I lived in an are prone to flooding I would think differently but I worry not that it would fill to the point I would have to get out or drown. But you never know.....what if my inground pool were to crack and release an underground river that shot my shelter out of the ground and it landed upside down and then a car fell on it? Then I'd really be in trouble.
Coz
I said run-off liquid, not flooding, which gasoline would never be.
If you had your shelter installed where you could not wash the floor of your garage then that's on you, wouldn't you say? The rest of the "what ifs" are indeed humorous.