Search
Once Anderson noted the loss of Fitzgerald, a search was launched for survivors. The initial search consisted of Anderson, and a second freighter, SS William Clay Ford. The efforts of a third freighter, the Canadian vessel Hilda Marjanne, were foiled by the weather. The U.S. Coast Guard launched three aircraft, but could not mobilize any ships. A Coast Guard buoy tender, Woodrush, was able to launch within two and a half hours, but took a day to arrive. The search recovered debris, including lifeboats and rafts, but no survivors.When Fitzgerald first vanished, it was widely believed the boat had snapped in half on the lake surface owing to storm action. Similar surface breakups in the past suggested bow and stern sections would be found miles apart on the lake floor. When underwater surveys revealed these sections were just yards from each other, it was concluded that Fitzgerald had instead broken upon hitting the lake floor.A Coast Guard investigation postulated that the accident was caused by ineffective hatch closures. These devices were unable to prevent waves from inundating the cargo hold. The flooding occurred gradually and probably imperceptibly throughout the final day, and finally resulted in a fatal loss of buoyancy and stability. As a result, the boat plummeted to the bottom without warning.The Coast Guard report proved controversial. The most common alternative theory contends that inoperative radar forced the crew to rely on inaccurate charts. As a result, Fitzgerald briefly ran aground or scraped a shoal near Caribou Island without the crew being aware of it. Consequently, she received bottom damage, which caused her to gradually take on water until she sank so suddenly in the deep water that none of her crew had time to react. The ship, pile-driving into the lake bottom, snapped in half, and its stern landed upside-down on the bottom. This theory is supported by final radio communications between Anderson and Fitzgerald; Anderson had been struck by two large waves that were heading toward Fitzgerald. If the hull had indeed been breached, it would be difficult to prove. Fitzgerald has settled in mud up to her load marks, making it impossible to inspect for damage.A documentary created and aired by the Discovery Channel investigated a large "fold" found in the hull plating. Previous defects with cargo hold covers and clamps as well as cracking issues were also addressed. Through the use of wave tanks and computer simulation, the Discovery Channel team concluded the loss of the SS Edmund Fitzgerald was due to a Rogue wave. Reports show three large waves were detected, two of which were reported by the Edmund Fitzgerald. As per the investigation, it was theorized that the SS Edmund Fitzgerald was badly battered by the first two waves, further damaging the dual radar (which shared a common antenna) and the hatch covers. It is surmised that the SS Edmund Fitzgerald took on water through the damaged cargo hold covers and was then overwhelmed by the third wave.