This is a memo form Evegeny Kapshin to Vsevolod Merkulov regarding the D-Day invasion of Normandy. The referred to FA is Feodor Alexeyevich, working with a special Ally group under the umbrella of the US Office of Strategic Services and UK Secret Intelligence Service.
It is generally accepted that this is the first observation of the device the SIS classified as the Zero Tunnel and the Russians codenamed Long Door.
12 JUNE 1944
TO: COMMISSAR V. MERKULOV
FROM: E. LAPSHIN, DEPARTMENT B
SUBJECT: FA REPORTS SSI DISCOVERY DURING NEPTUNE
NKGB agent FA has communicated after Neptune landing operations. OSS/SIS handlers have initiated agent into the Supernatural Shield Initiative under a special investigative unit, field team two (now designated SSI-2).
SSI-2 assignment matches earlier 1st Directorate intelligence; targets are confirmed as CWE and two German artificers (now designated ART1 and ART2), last documented in the area of Sainte-Marie-du-Mont, Normandy, France.
SSI sources directed SSI-2 to fortified bunker at Omaha Beach, Normandy, where FA witnessed CWE and ART1 escaping by way of an artificer machine. FA describes the machine as "a single engine, bigger than a jeep, with with no mechanical fittings I could recognize, connected to no visible generator, but with high grade power cables plugged into four prisoners of war". Upon activation, the machine "burned the prisoners from the inside out and opened a door in the air, with a German city on the other side".
FA did not recognize the city, but we are able to identify the Reichstag through provided descriptions, unconditionally confirming the city as Berlin.
As of this writing, the machine currently referred to under codename "Long Door" has been confiscated by United States Armed Forces, to be ultimately be moved under jurisdiction of Supernatural Shield Initiative.
Narkomindel as been in contact with OSS/SIS to request that I. Kurchatov be given equal opportunity to examine "Long Door". So far, both countries' representatives have been uncooperative.