Acknowledgments:

• Andrea Moro, Trieste, for historical informations.
• Martin Navarro, Perth (Western Australia), for the first news about Ardeola.
• The Graham Langmuir & Wotherspoon Collections, History and Glasgow Room for Aderno historical photo.
• John & Marion Clarkson for Aderno historical photo.
• Royal Navy Submarine Museum for HMS Torbay photos.
• Archives of Historical Office of Italian Navy (AUSMM) for documentation concerning the sinking.