Sunken Ship

Looking from our balcony and across the Bay of Cartagena you can barely make out the outline of what looks like some debris in the water. The rumor is that it is a sunken ship. Unfortunately, I haven't been able to find any information on when it sunk and how (if it is indeed a sunken ship)...I was kind of hoping to learn that it was a pirate ship and that the bay is now haunted. Here is a close-up:

 And here is a picture of the old city taken from the entrance to the bay (close to where the sunken ship is):