Bringing the valve inside is a standerd procedure and simpeler......you can still put a valve out side if some one needs to get at it from outside. I wouldent know why,,,but you can still do it....All of you seem to think that being rescued is an option...it is a very very slim option and the subs shoud not be desinged as this to be an option....When your in a sub....your on your own!!!!! DJB.