Rome - The secret accord was forged when the pair worked on Korean Peninsula covert projects in their early 20s during the turbulent North-South divide.
"We always suspected they spent their youth in Asia," a Spanish Inquisition source commented, "and now that work's done following the latest Pyongyang nuclear test."
According to NATO records the couple's wedding took place 60 years ago tomorrow on board a Chinese frigate that was soon sunk on General Eisenhower's orders.
Soon Sunk was subsequently outed as a North Korean double agent charged with building the world's biggest cryogenic stasis laboratories - one under the Vatican Catacombs and another under Buckingham Palace's swimming pool.
The two facilities have been under surveillance ever since, their regular Skype communications monitored by the CIA.
Look out for a puff of blue smoke at the Buckingham Palace flag staff around noon tomorrow.