Title Text:Wait a minute. If I’m escaping from a submarine at 50 meters, then I’ll *definitely* need a flashlight to find air pockets for gradual decompression on the way up. Time to start shopping professional dive lights. Origin:https://xkcd.com/909/ https://www.explainxkcd.com/wiki/index.php/909:_Worst-Case_Shopping 对于大多数人来说，在大多数情况下，手电筒的防水性是一个完全没有实际意义的点，因为大多数手电筒都在干地上使用。但是……