Greetings and welcome.
First off, you might want to upgrade to version 1.5 sooner than later.
Though I've never used version 1.4 myself, it is my understanding (
from reading various posts) that it's a bit buggy. When you pressed the "P" key, what depth did your sub dive to /or/ did it dive at all? Are you sure that you didn't hit the wrong key like I have done on occasion?
In any event, version 1.5 would be a good place to start for a fix.
