A team of New Hampshire technical divers has located the final resting place of the SS Cornwallis, a 400-foot Canadian freighter sunk by a German U-boat in the closing months of World War II. The discovery in the Gulf of Maine brings closure to an eight-decade-old maritime tragedy that claimed 43 lives.
The Portsmouth-based Nomad Exploration Team found the vessel resting nearly 400 feet below the surface roughly 10 miles southwest of Mount Desert Rock in July, culminating a search that began in 2019. The find marks another major regional recovery for the group, which previously located the William H. Machen in 2017 and the USS Eagle 56 a year later.
Originally built in 1921, the Cornwallis was carrying sugar, molasses, and a crew of 48 people, including seven armed guards, when it encountered the German submarine U-1230 on Dec. 3, 1944. The ship had previously survived a torpedo strike off Barbados two years earlier. Struck at approximately 6 a.m., the freighter sank within minutes. Five survivors were rescued by the Portland fishing trawler Notre Dame and transported to Rockland, while more than a third of the 43 victims hailed from Nova Scotia.
Historical records tie the same U-boat to Operation Elster, a Nazi intelligence mission that dropped two spies onto a beach in Hancock days before the torpedo attack. While those agents traveled onward to New York City before their mission was disrupted, the U-1230 remained off the Maine coast, intersecting with the ill-fated freighter.
Finding the wreck required extensive archival research, review of ship blueprints, consultations with historians, and interviews with local fishermen regarding debris locations, compass housing recoveries, and rescue sites. The team also contended with the notoriously difficult conditions of the Gulf of Maine, including severe weather, heavy fog, and strong tides near Mount Desert.
The discovery on July 11 nearly did not happen. During the second day of the expedition, the team passed within 300 feet of the wreck on the boat’s port side without recognizing the side-scan sonar image. They spotted the vessel during the final 100 yards of their last scheduled track while reprogramming their GPS.
Descending to the site pushed the experienced technical divers to their limits in what they described as some of their most daunting dives, characterized by extreme cold, heavy currents, and near-zero visibility after equipment failures. Despite the physical challenges, team members emphasized the historical and emotional significance of locating a war grave that had remained unmapped for 80 years, noting plans to return annually to monitor the site’s condition.
