IJN I-15 IJN Submarine (1940)
The IJN I-15 ended her short career without having sunk a single enemy surface vessel.
The B1 was 356.5 ft (108.7m) long, her beam was 30ft 5 in (9.3m) wide and the boat's draft was 16 ft 8 in (5.1m). In comparison to the 1940-era Gato American submarine class, the B1 was 45ft longer and had a 3,000 nm greater range as well as faster cruising speeds. Because of the vastness of the Pacific, Japan built boats for extreme range and size, many of which were capable of cruises lasting more than 100 days. In comparison, the Gato class had a maximum of a 75-day patrol.
The B1 (or I-15) had two diesel engines producing 12,400 horsepower (9,200kw) for running on the surface and to charge her batteries for submerged running there was an electric motor producing 2,000 horsepower (1,500kw). This power allowed the boat to operate at roughly 23.5 knots (44km/h) along the surface and 8 knots (15km/h) when submerged. At 16 knots (30km/h) she could cruise 14,000 nm (26,000 km). She required 94 officers and enlisted men and had an additional crew of two pilots that were needed to operate her onboard Yokosuka E14Y "Glen" seaplane used in reconnaissance duties. Some of the class carried this single seaplane, located in a hangar just in front of the conning tower, and was launched by a catapult. One Hundred Twenty-Six of the IJN Type 0 Small Reconnaissance Seaplane (Japanese designation of the aircraft) were built. The E14Y holds the distinction of being the only Japanese aircraft to drop bombs on the United States mainland in all of World War II, this occurring on September 9th, 1942 off the coast of Oregon. Besides a forest fire from the dropped incendiary bombs, no one was hurt and no property was damaged.
The I-15 is assigned to the Fleet (Submarines) under Rear Admiral Sato Tsutomu's command with Vice Admiral Shimizu Mitsumi's Sixth Fleet's Advance Expeditionary Fleet. Under "Operation Z" the I-15 was sent on her first war patrol off the north coast of Oahu on December 7,1941. She received the code signal "Climb Mt. Niitaka", a code indicating war would begin on 12/8/1941 Japan time. Her mission was to sink any warships that came into her patrol area from Pearl Harbor after the initial attack had begun. No ships appeared in her vicinity and I-15 was ordered to return to Japan. On 12/10 she received a signal that an American fleet was sighted nearby, this fleet including the USS Lexington and her escort. Admiral Shimizu ordered six boats to sink the carrier including the I-15. The American fleet was not sighted and she was ordered to proceed to the west coast to attack American ships.
A plan to shell San Francisco was reviewed and ordered for December 25th, 1941. Second thoughts stopped the attack due to concerns of retaliation for possible civilian deaths. She was then assigned to Sub Ron 1 and was operating around Kwajalein supporting a planned flying boat attack on Pearl Harbor named "Operation K1". The I subs were spotted by a ship from Halsey's Task Force 8 from USS Enterprise. I-15 was not hit but a number of Japanese ships were damaged including a submarine depot ship. After the attack, I-15 was ordered to attack the carrier but was recalled to support the K1 operation instead, this on February 5th, 1942. Five submarines equipped with floatplanes were used in support of the attack. The planes were removed and fitted with extra fuel tanks for the long flight. The target at Pearl was the ship repair docks that were missed on the opening December 7th, 1941 attack .
On February 20th, 1942 the USS Lexington was spotted by a Kawanishi flying boat and, with the element of surprise lost, the attack on Rabaul was cancelled. I-15 was diverted to intercept the carrier and sink her but the carrier was not found. Again she returned to aid the operation to attack Pearl Harbor and proceeded to French Frigate Shoals. The Kawanishi flying boats arrived and were refueled. The mission was a failure as cloud cover over the harbor caused the flying boats to miss Pearl and the planes dropped the bombs on Honolulu instead. I-15 was sent to Yokosuka for a scheduled overhaul.
In May of 1942 Commander Nobuo Ishikawa took I-15 on her second war patrol. Proceeding to Adak Alaska with the Northern Force she patrolled the Aleutians for allied shipping. Operation "AL" was the deception preceding the attack on Midway Island. I-15 used her float plane to scout and she carried out periscope observations of Kodiak Island. Twenty ships under Admiral Boshiro landed troops on Attu Island without opposition. I-15 was relieved and was returned to Yokosuka.
In August of 1942 the Japanese were building an aircraft landing field on Guadalcanal. As a result, the American "Operation Watchtower" was hastily conceived for the Invasion of Guadalcanal in the British Solomon Islands. The American operation on Guadalcanal opened up a seven month campaign to take the island.
In September of 1942, during the Battle of the Eastern Solomons, Commander Ishikawa sighted an enemy task force. He recognized the USS Enterprise, the battleship USS North Carolina (BB-55), two cruisers and five destroyers in the group. Commander Ishikawa wanted to conduct a coordinated attack and tried to contact the I-17 patrolling nearby with sonar using Morse code, but the I-17 did not answer the calls. Two of the screening destroyers detected the I-17 and subsequently dropped depth charges. After the attack ended, the I-15 surfaced and maintained contact with the enemy force. Rear Admiral Yamazaki the ordered the I-15 and I-17 to attack the task force. Up to this time, the I-15 had not sunk any allied ships and the crew was eager to sink an American war ship. On October 24th, 1942, Commander Ishikawa sighted another major enemy task force heading South from Santa Cruz. The I-15 may have also been sighted by the Americans. While taking evasive action to avoid the submarine contact, the USS South Dakota and the USS Mahan (DD-364) collided causing heavy damage to one another. I-15 did not attack.
The I-15 was recharging her batteries on the surface when Lieutenant Commander John Tennent's USS Southard (DMS-10), a fast minesweeper, made contact and opened fire with her 4.5-inch main gun. The I-15 submerged and moved in to attack. Ishikawa fired two torpedoes at the minesweeper which both missed their target. DMS-10 acquired the I-15 on sonar and dropped six depth charges in patterns over the next few hours. Now damaged and low on air, the I-15 needed to surface regardless of the situation topside. The USS Southard opened fire from about a mile away with a salvo hitting the I-15's conning tower. The direct hit forced the I-15 to sinks by the bow with all hands on board. She was presumed lost in the Guadalcanal area by the INJ and on December 24th, 1942, her name was officially struck from the naval list. Commander Ishikawa was promoted Captain posthumously in a short career with no recorded enemy ships sunk. Text ©2003-2013 www.MilitaryFactory.com • All Rights Reserved • No Reproduction Permitted
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Specifications for the
IJN I-15
IJN Submarine
Country of Origin: Imperial Japan
Initial Year of Service: 1940
Operators: Imperial Japan
Crew: 94
Length: 356.5ft (108.66m)
Beam: 30.5ft (9.30m)
Draught: 16.1ft (4.91m)
Displacement: 3,655tons
Machinery: 2 x shafts powered by electric motors generating 2,000 horsepower along with surface diesels generating 12,400bhp.
Surface Speed: 8kts (9mph)
Submerged Speed: 23kts (26mph)
Range: 16,110miles (25,927km)
Armament:
1 x 140mm cannon
6 x 533mm torpedo tubes (all in bow) with 17 x torpedoes.
Air Arm: 1 x Yokosuka E14Y1 aircraft
Ship Class: B1-Type
Number-in-Class: 20
Ships-in-Class: I-15; I-17; I-19; I-21; I-23; I-25; I-26; I-27; I-28; I-29; I-30; I-31; I-32; I-33; I-34; I-35; I-36; I-37; I-38; I-39
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