Talk:Spring 2017 Event/@comment-30539784-20170503015124/@comment-28781449-20170503021502

you CAN'T kill a sub at night, unless it's a combined fleet or night battle node. You, however, CAN deal damage to it. But all damage will be "nullified" and turn into "scratch damage", which is a percentage (6-12)of current HP rounded down. Thus, such damage can't cause sinking.