Talk:Fall 2019 Event/@comment-113.20.101.208-20191212055721/@comment-31411866-20191212060146

Your answer is in https://kancolle.fandom.com/wiki/Combat/Combined_Fleet general notes. I quote "The flagship of the escort fleet (a.k.a. second fleet) is currently unsinkable.
 * Winter 2015 Sink Test
 * Spring 2015 Sink Test
 * Fall 2015 Sink Test
 * Spring 2016 Sink Test (Node K -> L)
 * Other ships are not applicable. You might want a Fleet Command Facility.
 * In the Spring 2015 event, it became impossible to make a submarine flagship, presumably to prevent exploitation of this mechanic.
 * You can't begin a sortie with the escort fleet flagship moderately damaged."