Here are some pictures of the attack report of HS PAPANIKOLIS (Y-2) against an Italian Convoy on 25 Dec 1940 which resulted in the sinking of the liner FIRENCE (4000tns) and the cargo LIGURIA (7000tns)
HS PAPANIKOLIS
Here is a cave used as shelter douring the night after the attack
And here is the SAIL and one tube of HS PAPANIKOLIS today