C-3 and I-400 were the designations for a class of submarines built by the Japanese during World War Two. The 1-400 was an underwater aircraft carrier! It could surface, launch three planes and vanish. The !-25 was a football field sized mega-sub designed as a cargo carrier.
Both could travel from Japan to Germany without surfacing. Only a few of each class were built, although many more were planned. It is not known how many round trips were made by these submarines but it is known that they carried tons of war materiel, gold, rare metals–and mercury to the Nazis. They also carried experts of various kinds to both learn and pass on information about shared weaponry. These men had to lie in their bunks virtually for the entire journey–activity that would ensure they used the least amount of air and oxygen possible. The mercury is of special interest to many researchers. One sub carried 7 tons! This was more than could be used for any conventional purpose by the Germans.
Many theorize that the mercury was destined for the Jonestall Valley where ultra secret programs centered around Die Glocke (The Bell) a device that used massive amounts of mercury in its operation. It has been suggested that the device converted mercury into gold and U-235, fissionable Uranium that could have been used for an atomic bomb.
In “The Watch: The Secret War For the Soul of Germany” I explain how one I-25 was used to bring mercury and a Japanese swordmaster to Germany. The mercury was used to create a power plant for an Antarctic base built by the Nazis. The swordmaster is provided with ancient Roman metals from excavated swords and crucifixions–he uses them to create replicas of the Spear of Destiny for Himmler. One of them them, it is said, replaced the real one in the Viennese museum where the Spear and Austrian crown jewels were returned after the war. One of the most spectacular strikes against the Japanese supply line came on the night of June 22, 1944 when Ultra code intercepts revealed that 1-52, a C-3 cargo sub was to meet U-530 (see earlier blog about the U-530 surrender months after the war ended) in mid Atlantic off the Cape Verde Islands to take on a Enigma code machine and its operators as well as new specialized radar gear. Ship launched American planes attacked the two subs using new acoustic torpedoes. I-530 escaped unharmed–perhaps to carry Hitler or other officials to safety in Argentina. I-52 was struck by at least two torpedoes and sank with everyone on board. It was found in three miles of water by researcher Paul Tidwell in 1995–he hopes to recover $25 million in gold that was aboard the sub.