German submarine sighted on a large distance from Seattle, USA according to the U.S. Joint Intelligence Committee daily summary dated 31 May 1942

An item reported that on 30 May a enemy submarine was seen 630 miles west of Seattle along the US west coast.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 172 dated 31 May 1942