I served on a Royal Navy submarine. It annoys me probably more than it should that there always seems to be random leaks on submarines in film and tv. That wouldn't happen in real life. If you have a leak in your sub at those depths, you're completely fucked. Total implosion,
@fesshole cc to OP.
My first flight in a CH-47 meant I was sitting under a fluid valve. There was an intermittent drip. I noticed, grabbed the loadmaster as he passed, pointed it out.
He chuckled, said if there was a leak, it meant that there is still fluid in the lines, which is a good thing.
I sweated that flight, the bastards. =)