Hmmm. Happened to me now. Got stuck on the black screen...hit F12...
Couldn't take a cannon, though. I was bumping around it, but wouldn't let me take it.
Swimming out a little...
When you look at the three bridges, this is the left one. 4 cannons able to hit the Black Pearl at first, two additional cannons to prevent ships from coming INTO the harbor.
...and the right bridge. While this also has 6 cannons, they all face the Black Pearl as it approaches the bridges. The middle bridge still has only two cannons. No, it would not let me take the cannon...green circle would just blink blue then green again.
After swimming past the frigates, I turned left, swam under that mountain and came out in the high seas where Goliath used to be. Apparently, they don't let Goliath spawn at all now, until the bridges are all down.
Coming back around to the final forts, the game crashed.
