Talk:Summer 2016 Event/@comment-28418717-20160812191152/@comment-25938809-20160812191534

Simple, a ship's ASW rating needs to be 100 or more before OASW can happen. Isuzu has naturally high ASW, so boosting her to 100 with ASW gear isn't much of a problem. Most other ships, though... not nearly as easy even with an arsenal of Type 3 Sonars & depth charges.