Wow! This thread has really taken on a life of its own! I've come to a new conclusion: I'm going to affix my spare air within reach from the driver's seat. If I've got passengers with me I'll strap an 80 down in the back and run my 8ft octo forward. If we go into the water we can all just buddy breath and figure out some way to break the glass or open a door. Also, with the octo there will be plenty of time to gather our belongings, observe the muddy river bottom, etc.

What does everyone think