If you ever dropped your phone in a Venice canal (Italy) , this is how you can get help
I dropped my phone in a Venice canal the other day and asked a couple gondola (boat) drivers to help me out. They knew a guy (a scuba diver) who helped me out and could retrieve my phone in less than half an hour.
I was lucky because he was in the same area as I was.
He charged me 150 euros (cash) with no discounts and I think that was a bit expensive but was worth it.
His name is Luca and you can call him at :
+39 345 7747753
He doesn’t speak English but you would be able to find a local to help you out with speaking to him.
Good luck and take care of your phone :))