July 27, 2022 — The first large offshore wind farms in the United States are unearthing unexploded munitions from World War II, representing a potentially growing challenge for both developers and U.S. policymakers as the emerging industry anchors off America’s coasts.
While surveying the seafloor in the waters of Rhode Island’s Narragansett Bay in recent weeks, the Danish firm Ørsted found 11 unexploded weapons, prompting a warning to mariners by the Coast Guard.
“They range from 6-inch artillery shells to a 250-pound bomb,” said Ryan Ferguson, a spokesperson for Ørsted.
Reported to federal agencies like the Bureau of Ocean Energy Management and NOAA, as well as the U.S. military branches that operate offshore, the discoveries will add to an existing map of unexploded munitions up and down the Atlantic seaboard.
Known sites range from nearby hotbeds like Massachusetts’ Nomans Land island — once used by the Navy for target practice — to dumping grounds where the United States disposed of its post-war mountains of munitions after World War II. But other uncharted sites may exist, where sea and sand have moved historic hazards or unethical shippers dumped them outside established locations.
The Department of Defense in general has advised a leave-in-place policy, noting that objects have often become part of the marine ecosystem and that removal can cause harm.