Your life will be in some small amount of danger if you join any maritime force, simply by virtue of the fact that you shall find yourself 'riding' a tempestuous force that is prone to unpredictability - see rogue waves as a fine example. The Royal Navy is dangerous to an extent, but it's not as if we're losing a load of Navy boys at the moment, is it? I know a few and they're all doing fine. The waiting lists are so long at the moment you may as well apply anyway and then decide in the meantime whether you REALLY want to do it. Though you'll have to research your role well and prove you're really up to it at interview - presuming you meet your mark in the RT, of course.