Depends...how good are
You??
Sometimes they're easily confused, those are the good times
Sometimes they find you, and don't give up until you're dead
And then there's the times when, after chucking 5 hedgehogs at you without killing you, they get really mean, call in all their other Destroyer Escort buddies and start plastering you with more depth-charges than you'd care to count until you're dead, sunk, hung, drawn, quartered, chopped, grilled and mincified, and if you still won't give in they'll act like they've left in frustration, then when you finally dare to raise your periscope again some Sunderland drops a stick of bombs on it just to make sure.
And then they laugh at you from a long way off
but on other days it just rains...
Oh, and stay away from Buckleys too, they're unpleasant