Re: Hatchway alternatives?
Dave, if you really want to get out in a hurry, you lay up a couple of shaped charges or some primer cord against the hull and deck. That way when you want to get out "NOW NOW NOW" you just slap the big red button, and there are unobstructed exits in all the convenient places.
You know, if you own the boat, you have all those options.
I don't know why you'd ever need to evacuate the boat so quickly that you couldn't lift out hatchboard(s) but you do of course have all the options. Hinged doors, louvres, screens, grates, one board or two or three or four...this is why we say "Whatever floats your boat."