Not many of non-italians know this page of history, the attack of the Italian frogmen to Alexandria, far before the birth of Navy Seals. So Dec 18th is a good day for remembrance.
What happened in Alexandria harbour on the night between Dec 18th and 19th 1941?
Six Italian frogmen of the Regia marina sank three British ships, and damaged another.
Read a short summary of the events here (please pay attention to the last rows of this article):
http://www.normandy1944.org.uk/new_page_21.htm
Or a more in-depth narration here:
https://www.usnwc.edu/getattachment/f9f595b1-7547-4929-8d05-b2e798390a3c/Frogmen-against-a-Fleet--The-Italian-Attack-on-Ale.aspx
The same elite unit exist still today in the Italian Navy, and is named CONSUBIN
http://www.specwarnet.net/europe/comsubin.htm