Part One - The Uranium Bomb
Chapter One - U-234/U235
"The most important and secret item of cargo, the uranium oxide,
which I believe was radioactive, was loaded into one of the vertical steel
tubes [of German U-boat U-234].... Two Japanese officers... [were]...
painting a description in black characters on the brown paper wrapping....
Once the inscription U235 (the scientific designation for enriched uranium,
the type required to make a bomb - author's note) had been painted on the
wrapping of a package, it would then be carried over...and stowed in one
of the six vertical mine shafts." [i]
"Lieut Comdr Karl B Reese USNR, Lieut (JG) Edward P McDermott USNR
and Major John E Vance CE USA
"I just got a shipment in of captured material.... I have
just talked to Vance and they are taking it off the ship.... I have
about 80 cases of U powder in cases. He (Vance) is handling all of
that now."iii
The
traditional history of the atomic bomb accepts
as an unimportant footnote the arrival of U-234 on United States shores,
and admits the U-boat carried uranium oxide along with its load of powerful
passengers and war-making materials. The accepted history also acknowledges
these passengers were whisked away to Washington for interrogation and
the cargo was quickly commandeered for use elsewhere. The traditional history
even concedes that two Japanese officers were onboard U-234 and that they
committed a form of unconventional Samurai suicide rather than be captured
by their enemies.
The traditional history denies, however, that the uranium
on board U-234 was enriched and therefore easily usable in an atomic bomb.
The accepted history asserts there is no evidence that the uranium stocks
of U-234 were transferred into the Manhattan Project, although recent suggestions
have hinted that this may have occurred. And the traditional history asserts
that the bomb components on board U-234 arrived too late to be included
in the atomic bombs that were dropped on Japan. The documentation indicates
quite differently on all accounts.
Before U-234 had landed at Portsmouth - before it even left
Europe - United States and British intelligence knew U-234 was on a mission
to Japan and that it carried important passengers and cargo.iv A portion
of the cargo, especially, was of a singular nature. According to
U-234's chief radio operator, Wolfgang Hirschfeld, who witnessed the loading
of the U-boat:
The most important and secret item of cargo, the uranium
oxide, which I believe was highly radioactive, was loaded into one of the
vertical steel tubes one morning in February, 1945. Two Japanese
officers were to travel aboard U-234 on the voyage to Tokyo: Air Force
Colonel Genzo Shosi, an aeronautical engineer, and Navy Captain Hideo Tomonaga,
a submarine architect who, it will be recalled, had arrived in France aboard
U-180 about eighteen months previously with a fortune in gold for the Japanese
Embassy in Berlin.
I saw these two officers seated on a crate on
the forecasting engaged in painting a description in black characters on
the brown paper wrapping gummed around each of a number of containers of
uniform size. At the time I didn't see how many containers there
were, but the Loading Manifest showed ten. Each case was a cube,
possibly steel and lead, nine inches along each side and enormously heavy.
Once the inscription U235 had been painted on the wrapping of a package,
it would then be carried over to the knot of crewmen under the supervision
of Sub-Lt Pfaff and the boatswain, Peter Scholch, and stowed in one of
the six vertical mineshafts.v
Hirschfeld's straightforward account of the uranium being
"highly radioactive" - he later witnessed the storage tubes being tested
with Geiger counters,vi - and labeled "U235" provides profoundly important
information about this cargo. U235 is the scientific designation
of enriched uranium - the type of uranium required to fuel an atomic bomb.
While the uranium remained a secret from all but the highest levels within
the United States until after the surrender of U-234, a captured German
ULTRA encoder/decoder had allowed the Western Allies to intercept and decode
German and Japanese radio transmissions. Some of these captured signals
had already identified the U-boat as being on a special mission to Japan
and even identified General Kessler and much of his cortege as likely to
be onboard, but the curious uranium was never mentioned. The strictest
secrecy was maintained, nonetheless, around the U-boat.
Press representatives may be permitted to interview officers and
men of German submarines that surrender. This message applies only
to submarines that surrender. It does not apply to other prisoners
of war. It does not apply to prisoners of the U-234. Prisoners
of the U-234 must not be interviewed by press representatives.vii
Two days later, while the Sutton was slowly steaming toward
Portsmouth with U-234 at her side, more orders were received. "Documents
and personnel of U-234 are most important and any and all doubtful personnel
should be sent here,"viii the commander of naval operations in Washington,
D.C. ordered. The same day, the commander in chief of the Navy instructed,
"Maintain prisoners U-234 incommunicado and send them under Navy department
representative to Washington for interrogation."ix
The effort to keep U-234
under wraps was only partially successful. Reporters had been allowed to
interview prisoners from previous U-boats, and, in fact, were allowed to
interview captured crews from succeeding U-boats, as well. When the
press discovered U-234 was going to be off limits, a cry and hue went up
that took two days to settle. Following extended negotiations, a compromise
was struck between the Navy brass and the press core.x
The reporters
were allowed to take photographs of the people disembarking the boat when
it landed, but no talking to the prisoners was permitted.xi When
they landed at the pier, the prisoners walked silently through the gawking
crowd and climbed into buses, to be driven out of the spotlight and far
from the glaring eyes of history. On 23 May, the cargo manifest of U-234
was translatedxii by the office of Naval Intelligence, quickly triggering
a series of events. On the second page of the manifest, halfway down
the page, was the entry "10 cases, 560 kilograms, uranium oxide."
Whoever first read the entry and understood the frightening capabilities
and potential purpose of uranium must have been stunned by the entry.
Certainly questions were asked. Was this the first shipment of uranium
to Japan or had others already slipped by? Did the Japanese have the capacity
to use it? Could they build a bomb?
Whatever the answers, within four days personnel from the
Office of Naval Intelligence had brought U-234's second watch officer,
Karl Pfaff - who had not been brought to Washington with the original batch
of high-level prisoners, but who had overseen loading of the U-boat in
Germany - to Washington and interrogated him. They quickly radioed
Portsmouth:
Pfaff prepared manifest list and knows kind documents and
The identification that the uranium was stowed in gold-lined
cylinders and that it would become "sensitive and dangerous" when unpacked
provides clear substantiation of radio officer Hirschfeld's assertion that
the uranium was labeled with the title U235. Uranium that has had its proportion
of the isotope U235 increased compared to the more common isotope of uranium,
U238, is known as enriched uranium. When that enrichment becomes 70 percent
or above, it is bomb-grade uranium. The process of enriching uranium
during the war was highly technical and very expensive - it still is.
Upon first reading that the uranium on board U-234 was stored in
gold-lined cylinders, this author tracked down Clarence Larsen, former
director of the leading uranium enrichment process at Oak Ridge, Tennessee,
where the Manhattan Project's uranium enrichment facilities were housed.
In a telephone conversation, I asked Mr. Larsen what, if anything, would
be the purpose of shipping uranium in gold-lined containers.xiv
Mr.
Larsen remembered that the Oak Ridge program used gold trays when working
with enriched uranium. He explained that, because uranium enrichment
was a very costly process, enriched uranium needed to be protected jealously,
but because it is very corrosive, it is easily invaded by any but the most
stable materials, and would then become contaminated. To prevent
the loss to contamination of the invaluable enriched uranium, gold was
used. Gold is one of the most stable substances on earth. While
expensive, Mr. Larsen explained, the cost of gold was a drop in the bucket
compared to the value of enriched uranium. Would raw uranium, rather than
enriched uranium, be stored in gold containers, I asked? Not likely,
Mr. Larsen responded. The value of raw uranium is, and was at the
time, inconsequential compared to the cost of gold.
Assuming the Germans invested roughly the same amount of
money as the Manhattan Project to enrich their uranium, which it appears
they did,xv the cost of the U235 on board the submarine was somewhere in
the neighborhood of $100,000 an ounce; by far the most expensive substance
on earth. The fact that the enriched uranium had the capacity to
deliver world dominance to the first country that processed and used it
made it priceless. A long voyage with the U235 stowed in anything
but gold could have cost the German/Japanese atomic bomb program dearly.
In addition to the gold-lined shipping containers corroborating Hirschfeld's
identification of the uranium as U235, the description of the uranium's
characteristics when its container was opened also tends to support the
conclusion the uranium was enriched. Uranium of all kinds is not
only corrosive, but it is toxic if swallowed. In its raw state, however,
which is 99.3 percent U238, the substance poses little threat to man as
long as he does not eat it. The stock of raw uranium that eventually
was processed by the Manhattan Project originally had been stored in steel
drums and was sitting in the open at a Staten Island storage facility.xvi
Much of the German raw uranium discovered in salt mines at the end of the
war also was stored in steel drums, many of them broken open.
The
material was loaded into heavy paper sacks and carried from the storage
area by apparently unprotected G.I.s.xvii Since then, more precautions
have been taken in handling raw uranium, but at the time, caution was minimal
and raw uranium was considered to be relatively safe.xviii For the
Navy to note the uranium would become "sensitive and dangerous" and should
be "handled like crude TNT" when it was unpacked tends to indicate that
the uranium enclosed was, in fact, enriched uranium. Uranium enriched significantly
in U235 is radioactive and therefore should be handled with appropriate
caution, as the communiqué described.
By 16 June 1945, a second cargo manifest had been prepared
for U-234, this time by the United States Navy. But the uranium was
not on the list. It was not even marked as shipped out or having
once been on hand. It was never mentioned. It was gone - as
if it never existed.
Lieut. Comdr. Karl B Reese USNR, Lieut (JG) Edward P McDermott USNR
and Major John E Vance CE USA [Corps of of Engineers, United States Army
(the Manhattan Project's parent organization) - author's note] will
report to commandant May 30th Wednesday in connection with cargo U-234.
It is contemplated that shipment will be made by ship to
The order, dispatched by the chief of naval operations, is revealing
if not outright startling for the selection of one member of its three-man
team. Including Major Vance of the Army Corps of Engineers in what was
otherwise an all Navy operation seems a telling selection. The military
services of the United States, as in most other countries, were highly
competitive with one another. True, U-234's cargo included a mixed
bag of aeronautics, rocketry and armor-piercing technology that the Army
could use, too, but the Navy had programs for all of these materials and
surely would have done its own analysis first and then possibly shared
the information with its service brothers.
Major John E. Vance was not only from the Corps of Engineers,
the Army department under which the Manhattan Project operated, but, if
a telephone transcript taken from Manhattan Project archives refers to
the same "Vance" as the Major assigned to offload U-234 - as it appears
to - then he was part of America's super-secret atomic bomb project, as
well. The transcript is of a conversation between Manhattan Project intelligence
officers Smith and Traynor and was recorded two weeks after "Major Vance"
was assigned to the team responsible for unloading the material captured
on U-234.
Smith: I just got a shipment in of captured material and there were
39 drums and 70 wooden barrels and all of that is liquid. What I
need is a test to see what the concentration is and a set of recommendations
as to disposal. I have just talked to Vance and they are taking it off
the ship and putting it in the 73rd Street Warehouse. In addition
to that I have about 80 cases of U powder in cases. He (Vance) is
handling all of that now. Can you do the testing and how quickly
can it be done? All we know is that it ranges from 10 to 85 percent
and we want to know which and what.
Traynor: Can you give me what was in those cases?
Traynor: The other stuff is something else?
U-234's cargo manifest reveals that, besides its uranium, among
its cargo was 10 "bales" of drums and 50 "bales" of barrels. The
barrels are noted in the manifest to have contained benzyl cellulose, a
very stable substancexxi that may have been used as a biological shield
from radiation or as a coolant or moderator in a liquid reactor.xxii
The manifest lists the drums as containing "confidential material."
As surprising as it may seem, this secret substance may have been the "water"
that Major Smith noted in his discussion with Major Traynor. Why would
Major Smith want the water tested? And what did he mean when he said
that its concentration ranged "from 10 to 85 percent and we want to know
which and what"?
The leaders of the German project to breed plutonium had
decided to use heavy water, or deuterium oxide, as the moderator for a
plutonium-breeding liquid reactor. The procedure of creating heavy
water results in regular water molecules picking up an additional hydrogen
atom. The percentage of water molecules with the extra hydrogen represents
the level of concentration of the heavy water. Thus Major Smith's
seemingly overzealous concern about water and his question about concentration
is predictable if Smith suspected the material was intended for a nuclear
reactor. And using heavy water as a major element of their plutonium breeding
reactor project, it is easy to see why the Germans labeled the drums "confidential
material." The evidence indicates that U-234 - if the captured cargo
being tested by "Vance" was from U-234, which seems very probable given
all considerations - carried components for making not only a uranium bomb,
but a plutonium bomb, also.
Further corroborating the connection of the barrels and
drums as those that were taken from U-234 is a handwritten note found in
the Southeast national archives held at East Point, Georgia.xxiii
Dated 16 June, 1945, two days after Smith's and Traynor's telephone conversation,
the note described how 109 barrels and drums - the exact total given in
the Smith/Traynor transcript - were to be tested with geiger counters to
determine if they were radioactive. The note also included instructions
that an "intelligence agent cross out any markings on drums and bbls. [sic.
- abbreviation for barrels - authors note] and number them serially from
1 to 109 and make note of what was crossed out." The note goes on
to say that this recommendation was given to and approved by Lt.Colonel
Parsons, General Groves' right-hand man on the military side of the Manhattan
Project. And lastly, the writer of the note had called Major Smith,
apparently to report back to him, leading one to believe the note's author
may have been Major Traynor.
Was the captured cargo discussed by Smith and Traynor from
U-234? The presence of a Mr. "Vance" who was in charge of "U powder,"
almost certainly determines that such was the case. The documents
under consideration and the conversation they detail are from Manhattan
Project files and are about men who worked for the Manhattan Project. Using
the letter "U" as an abbreviation for uranium was widespread throughout
the Manhattan Project. That there could have been another "Vance"
who was working with uranium powder - especially "captured" uranium powder
- seems unlikely even for coincidence.
And the fact that the contents
of the barrels listed on the U-boat manifest were identified as containing
a substance likely to be used in a nuclear reactor, benzyl cellulose, and
that the barrels in the Smith/Traynor transcript and the untitled note
- as well as the drums - were tested for radioactivity by geiger counter,
certainly links the "captured" materials to no other source than U-234.
The new-found evidence taken en mass demonstrates that, despite the traditional
history, the uranium captured from U-234 was enriched uranium that was
commandeered into the Manhattan Project more than a month before the final
uranium slugs were assembled for the uranium bomb.
The Oak Ridge
records of its chief uranium enrichment effort - the magnetic isotope separators
known as calutrons - show that a week after Smith's and Traynor's 14 June
conversation, the enriched uranium output at Oak Ridge nearly doubled -
after six months of steady output.[xxiv] Edward Hammel, a metallurgist
who worked with Eric Jette at the Chicago Met Lab, where the enriched uranium
was fabricated into the bomb slugs, corroborated this report of late-arriving
enriched uranium. Mr. Hammel told the author that very little enriched
uranium was received at the laboratory until just two or three weeks -
certainly less than a month - before the bomb was dropped.[xxv] The Manhattan
Project had been in desperate need of enriched uranium to fuel its lingering
uranium bomb program. Now it is almost conclusively proven that U-234
provided the enriched uranium needed, as well as components for a plutonium
breeder reactor.
Wolfgang Hirschfeld
Chief Radio Operator of U-234
will report to commandant May 30th Wednesday in connection with
cargo U-234." [ii]
US Navy secret transmission
#292045 from Commander
Naval Operations to Portsmouth Naval
Yard, 30 May 1945
Telephone transcript between Manhattan
Project security officers
Major Smith and Major Traynor, 14 June,1945.
As early as 13 May, the day before U-234 was actually boarded
by the Sutton's prize crew, orders had already been dispatched that commanded
special handling of the passengers and crew of U-234 when it was surrendered:
cargo in each tube. Pfaff states...uranium oxide loaded in
gold cylinders and as long as cylinders not opened can be
handled like crude TNT. These containers should not be
opened as substance will become sensitive and dangerous.xiii
Where did the uranium go? Eleven days after U-234 was escorted
into Portsmouth, and four days after Pfaff identified its location on the
U-boat, a team was selected to oversee the offloading of U-234. Portsmouth
received the following message:
ordnance investigation laboratory NAVPOWFAC Indian
Head Maryland if this is feasible.xix
Someone, somewhere at a very high level, appears to have
seen that the Army was brought into the scavenging operation that had become
U-234; not just any Army group, but the group that oversees the Manhattan
Project - the Corps of Engineers.
Smith: U powder. Vance will take care of the testing
of that.
Smith: The other is water.xx
Notes:
i Wolfgang Hirschfeld and Geoffrey Brooks, Hirschfeld:The Story of A U-boat NCO 1940-1946, pp. 198,199
ii US Archives NARA II, U-boat U-234 file, US Navy secret dispatch
#292045, 30 May 1945
iii US Archives Southeast Region, East Point, Georgia, telephone transcript titled Telephone Conversation Between Major Smith, WLO and Major Traynor, 14 June, 1945
iv US Archives NARA II, extract of intercepted transmission sent from Chief Inspector in Germany to Bureau of Military Operations and Military Affairs, #165, 15 April, 1945, declassified # NND975001, NARA date 9/15/97
v Wolfgang Hirschfeld and Geoffrey Brooks, Hirschfeld:The Story of A U-boat NCO 1940-1946, pp. 198,199
vi Wolfgang Hirschfeld and Geoffrey Brooks, Hirschfeld:The Story of A U-boat NCO 1940-1946, Appendix
vii US Archives NARA II, U-boat U-234 file, confidential dispatch #131509, 13 May 1945
viii US Archives NARA II, U-boat U-234 file, secret dispatch #151716, 15 May, 1945
ix US Archives NARA II, U-boat U-234 file, secret dispatch #151942, 15 May, 1945, declassified #NND745085
x US Archives NARA II, U-boat U-234 file, Log of Public Relations - Restricted, by Commander N.R. Collier, 17 May, 1945; transcript, Telephone Conversation Between Capt. V.D. Herbster, USN (Ret.), and Commodore Kurtz, U.S.N. E.S.F., 18 May, 1945; second telephone conversation transcript Captain Herbster and Commodore Kurtz, 18 May, 1945
xi US Archives NARA II, U-boat U-234 file, Log of Public Relations - Restricted, by Commander N.R. Collier, 17 May, 1945; transcript, Telephone Conversation Between Capt. V.D. Herbster, USN (Ret.), and Commodore Kurtz, U.S.N. E.S.F., 18 May, 1945; second telephone conversation transcript Captain Herbster and Commodore Kurtz, 18 May, 1945
xii US Archives NARA II, Manifest of Cargo For Tokio On Board U-234, translated from German, 23 May, 1945, declassified #NND903015, NARA Date 12/11/93
xiii US Archives NARA II, secret dispatch #262151, 27 May, 1945
xiv Personal telephone conversation between the author and Clarence Larsen, Director of Y-12 calutrons operations at Oak Ridge, no date recorded
xv Joseph Borkin, The Crime and Punishment of I.G. Farben, p 116; Paul Manning, Nazi In Exile, p.153; compare to Chapter Four, page 82
xvi Richard Rhodes, The Making of the Atomic Bomb, p. 427
xvii Richard Rhodes, The Making of the Atomic Bomb,p p. 608, 609
xviii Richard Rhodes, The Making of the Atomic Bomb, p. 461
xix US Archives NARA II, U-boat U-234 file, US Navy secret dispatch #292045, 30 May 1945
xx US Archives Southeast Region, East Point, Georgia, telephone transcript titled Telephone Conversation Between Major Smith, WLO and Major Traynor, 14 June, 1945
xxi Personal telephone conversation between the author and Dr. Susan Frost, PhD, Associate Professor of Biochemistry and Molecular Biology, College of Medicine, University of Florida, 30 August 1999, also Dr. Wentworth, University of Houston
xxii Interscience Publishers, Concise Encyclopedia of Nuclear Energy, p. 688
xxiii US Archives NARA Southeast Region, East Point, GA, untitled handwritten note dated 6/16/45
xxiv US Archives NARA Southeast Region, East Point, GA, Beta Oxide Transfer Report; see also chart on page __
xxv Personal telephone conversation between the author and Edward Hammel, Manhattan Project metallurgist, 14 May, 1996