We once hear a radio call to CG from a 40ft yacht 15mile off Anglesey. Flat calm, no wind and sunny. Engine broken down.
We pulled it with a fishing boat maxing out at about 5mph all the way to Beaumaris and put it on a bouy so an engineer could look at it in the morning. It took us 3hours to get to shore then another 2 hours to Beaumaris.
In the morning the skipper of our boat went out and said, "so, what's the problem.....blah blah.. I take it you tried bleeding it?" "No, don't know how."
OMG they were delivering a yacht from America to Spain, brand new worth god knows how much and didn't know not only how to bleed an engine, but when it is likely to occur!
10 mins later they were on their way. What a waste of time. Though we did get a bottle of scotch out of it. I say we, i was a kid at the time.