You don't have to be a sailor to be in the same boat as someone else!
Oh no. It's a metaphor to say you are in the same situation as other people. Very often, it's not a good situation.
Possibly, in communist times in Poland when commodities were hard to get, you could say you were all in the same boat - excluding those who worked the system of course!
Now, back to boats - the most famous boat race in England is the Oxford, Cambridge University boat race which takes place every year on the River Thames (pronounced Temz)in London.
Here's a very old film clip with an accent that is called received English or sometimes BBC English. I don't know if a non native can tell the difference but to a native it sounds rather strange and twisted.
OK, here's the race - do you ever get that sinking feeling? These guys really are all in the same boat!
