another article about it, this time mentioning more about the two shells the cre tossed voerboard after dredging them up. And it was WWI cannisters and shells.

[link to www.longislandpress.com]

State and federal officials worked Tuesday to decontaminate a clam boat anchored in isolation off Massachusetts after it dredged up old munitions containing mustard gas, severely sickening a crewman.

The Coast Guard was trying to locate the two military shells, which the crew tossed overboard in about 60 feet of water about 45 miles south of Long Island, said Coast Guard Petty Officer James Rhodes. He acknowledged finding the shells will be difficult.

80% rule applies. More at link