Operation Caesar was a secret mission carried out by Germany in World War II to supply Germany's faltering ally, Japan, with advanced technology to fuel their war machine. The operation was a complete failure.
The engagement that ended the mission is the only known instance in history of one submerged submarine sinking another submerged submarine.
On 5 December 1944, U-864, on her maiden voyage, was despatched on a secret mission to deliver supplies to Japan. U-864's primary cargo was advanced Messerschmitt jet engine parts for use in Japanese aircraft and V-2 missile guidance systems. Her secondary cargo comprised 65 tonnes of mercury in 1,857 canisters for use in weapons production.
She left Kiel and headed north. While going through the Kiel Canal, U-864 grounded and damaged her hull. Her captain, Ralf-Reimar Wolfram, decided to sail to the U-boat pens at Bergen, Norway. On 12 January 1945, while U-864 was still undergoing repairs, British bombers attacked the pens, delaying the repairs further. The repairs were completed in early February and Wolfram embarked on his mission once again. British code breakers at Bletchley Park deciphered Enigma encoded transmissions and were alerted to U-864's mission. To counter the German U-boat, the Admiralty diverted the submarine HMS Venturer, which had just left Lerwick in Scotland, to the coasts of Fedje, Norway to search for U-864.
On 6 February 1945, U-864 began experiencing trouble with one of her engines, which began misfiring, greatly increasing the sounds the U-boat made. Wolfram contacted Bergen, informing them that he would be returning for further repairs. Wolfram was told that an escort would be waiting for them at Hellisoy on the 10th. At the same time, Venturer, commanded by Lieutenant James Launders arrived in Fedje and began searching for the U-boat. On 9 February, Venturer's hydrophone operator detected a noise that sounded like a diesel engine. Launders raised periscope and surveyed the horizon, he spotted another periscope and began stalking it, assuming that it was U-864.
As Venturer followed the German U-boat, it became apparent that they had been spotted due to the erratic, zigzag course U-864 began to take. After following the German submarine for three more hours, Venturer's crew made a calculated decision based on U-864's movements. At intervals of 17.4 seconds, Venturer fired all four of her torpedoes. Hearing the incoming torpedoes, U-864 took evasive maneuvers, successfully avoiding the first three torpedoes, but unknowingly steered into the path of the fourth. The torpedo struck the U-boat, splitting her in half and sending her to the ocean floor. All 73 of her crew perished.
The operation was a complete failure for the Germans. If it had not been for the damage the U-boat sustained, or the British bombing of Bergen, U-864 would have had a month's lead on Venturer by the time the Enigma code was broken and she was detached. The outcome could have been very different.
The Germans lost U-864 and all 73 of her crew, including her captain, Ralf-Reimar Wolfram.
The British suffered no casualties or damage. For his actions at Fedje, Lieutenant Launders received the Distinguished Service Order.
After coming across documents listing mercury as one of the cargoes on board U-864, the Royal Norwegian Navy began searching for the wreckage. After searching for five years, the U-boat was located in October 2003 by the mine control vessel HNoMS Tyr. After examining the site for two years, it became apparent that the mercury was indeed leaking into the ocean at increasing rates every year. Due to the hazards of mercury, fishing is now prohibited in the region. The Norwegian Coastal Administration has recommended entombing the submarine in 12 meters of sand and concrete, effectively sealing the mercury off.
Source: Wikipedia - Operation Caesar
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