A nonthreatening and very effective seat belt cutter is one of those letter openers that are about the size of business card with a razor blade hidden inside. <br><br>http://www.safetycentral.com/emeswinpunse.html<br>Is an example of those seat belt cutters.<br><br>Use your favorite search engine and type in SEAT BELT CUTTER. The item costs about $5-$6. A window punch about the size of a normal writing pen is about the same cost. Get a bit of the adhesive backed velcro and velcro the seat belt cutter to your visor. <br><br>That way it is easy to see and reach in an accident. You could put the window punch in the same place.<br><br>An alternate is the Life Hammer. It is a plastic hammer shaped devise with a built in seat cutter and a metal tip for breaking windows. Cost more, are heavier, bulkier and require more space to store and use than a window punch.<br><br>If you are concerned about getting out of a sinking car, here are a few tips. Roll down the window. You can either exit through the window or it will allow the interior to fill with water equalizing the pressure in and out of the car. Then the door can be opened and you can swim out. Power windows will work for several minutes after a vehicle has been submerged.