Acknowledgements:

• Harry Sonner, 3° class signalman, veteran of USS Swerve and survivor to the sinking.
• Amerigo Salvini, for his contribution on the research on the Operation Shingle.
• Anzio Beachhead Research and Documentation Center.
• Marco Bellosi, Alberto and Ezio Ruberto for thei support in the research and identification of the USS Swerve.
• Naval Historical Center, Washington Underwater Archaeology Branch.
• Naval Mine Warfare Association and the historician Joseph F. Schreiber Jr. for the material on the minesweeping methods.
• U.S. Naval Institute Photo Archives (www.usni.org) for the prints of minesweeper.
• Alessandro Fornai and Cristina Nicolai for the support during the dive.

References:

• Samuel Eliot Morison, Hystory of US Naval operations in World War II: Sicily-Salerno-Anzio. Vol. IX. Little Brown & co. Boston, 1954.
• Arnold S. Scott, Most Dangerous Sea, US Naval Institute, Annapolis. Maryland.
• Harry Sonner, USS Swerve AM 121, That fateful day, The Silent Defenders, Spring 1999.
• Naval Historical Center, Dictionary of American Naval Fighting Ships, volume 6.