After the war,FBI had investigated in these things, but no results.Rare countries had submarines ecsept America Japon and Ganman,but both Garman and Japon denied to send submarine to these battles.

• 战争结束后，美国的情报部门曾专门就此事展开调查，却没有什么结果，当时有潜水艇的只有美国和德国、日本等寥寥几个国家，但德国和日本都否认曾派遣过潜艇到这些个海战现场。