Denyav wrote:

How Dr.Alvares who was unable to design even one working ignitor for plutonium
bomb for 18 months,designed an excellent ignitor at the virtually last minute
after he inspected U-234 cargo and debriefed Dr.Schlicke,the scientific
passenger of U-234?


1945.1 (= Jan 1945) [U. S. A.] An ignition device for implosion
completed by Luis W. Alvarez.
http://www.ask.ne.jp/~hankaku/english/np7y.html

That was some 4 months before the U-234 episode.