About a million people a year head out on Massachusetts Bay for whale-watching cruises, according to Deborah Marx of the National Oceanic and Atmospheric Administration. The stretch of ocean from Cape Ann to the tip of Cape Cod is especially rich with marine life due in large part to Stellwagen Bank, an underwater plateau formed during the Ice Age, now designated a National Marine Sanctuary.
While on the water, whale-watch guides often introduce passengers to another intriguing feature of Stellwagen Bank: It is a burial ground for dozens of ships that have sunk there over the years.
On Feb. 18, Marx and Matthew Lawrence, a fellow NOAA maritime archeologist, will present “The Shipwrecks of Stellwagen Bank’’ at Maritime Gloucester. The presentation features “The Wreck of the Steamship Portland,’’ a 45-minute Science Channel documentary on the 1898 disaster, which Marx said is the sanctuary’s poster child for shipwrecks and the secrets they keep.
