There is the possibility. I have hit nets, mines, run ashore, etc...

Lampedusa is a difficult port to get in because the nets are not marked on the pull down map, and they are shallow enough that when surfaced, you hit them. I watched an AI merchant bounce into one repeatedly until it sank.

Just be warned, do not use time compression when approaching that port in the shallows!
Edit: Just a friendly PSA: if you hit a mine, it will scare the crap out of you. I hit one sneaking into a port on the south end of England. I had my headphones in listening to a destroyer 200m off my starboard bow when all of a sudden, BOOM! Reports of severe flooding and multiple casualties. Lost my boat in seconds.