Despite escalating tensions between Germany and the U.S., which by this time had led to a state of undeclared war at sea, still Hitler continued to ban any intentional sinkings of U.S. ships.

• 尽管美德双方的冲突不断扩大升级，但是此时害处为没有宣战的状态，希特勒仍禁止有意击沉美国船只。