On 14 November , the commandos torpedoed Attack the `` Mirna '' -class patrol boat PČ-176 `` Mukos '' close to the island of Brač in the Split Channel of the Adriatic Sea , prompting Causation a Yugoslav naval bombardment Attack of Brač and Šolta Island the same day .

The ship was identified Check and torpedoed Destroying by the German U-boat and sank in 18 minutes , and also took on a heavy starboard list .

Within hours , in the morning of 24 February , the torpedoed Attack her , killing Killing an estimated 781 refugees plus 10 crew , making it Causation the Black Sea 's largest exclusively civilian naval disaster Catastrophe of World War II .