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Japanese submarine Ro-37
Ro-37 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in June 1943, she served in World War II and was sunk during her second war patrol in January 1944.
The submarines of the K6 sub-class were versions of the preceding K5 sub-class with greater range and diving depth. They displaced 1,133 tonnes (1,115 long tons) surfaced and 1,470 tonnes (1,447 long tons) submerged. The submarines were 80.5 meters (264 ft 1 in) long, had a beam of 7 meters (23 ft 0 in) and a draft of 4.07 meters (13 ft 4 in). They had a diving depth of 80 meters (260 ft).
For surface running, the boats were powered by two 2,100-brake-horsepower (1,566 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 600-horsepower (447 kW) electric motor. They could reach 19.75 knots (36.58 km/h; 22.73 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the K6s had a range of 11,000 nautical miles (20,000 km; 13,000 mi) at 12 knots (22 km/h; 14 mph); submerged, they had a range of 45 nmi (83 km; 52 mi) at 5 knots (9.3 km/h; 5.8 mph).
The boats were armed with four internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of ten torpedoes. They were also armed with a single 76.2 mm (3.00 in) L/40 anti-aircraft gun and two single 25 mm (1.0 in) AA guns.
Ro-37 was laid down as Submarine No. 203 on 9 October 1941 by the Sasebo Navy Yard at Sasebo, Japan. She was renamed Ro-37 on 20 June 1942, and was provisionally attached to the Maizuru Naval District that day. She was launched on 30 June 1942 and completed and commissioned a year later on 30 June 1943.
Upon commissioning, Ro-37 was attached formally to the Maizuru Naval District and assigned to Submarine Squadron 11 for workups. On 16 September 1943 she was reassigned directly to 6th Fleet headquarters, and she departed Maizuru bound for Truk on 22 September 1943. During her voyage, she was reassigned to Submarine Division 1 in the 6th Fleet on 24 September 1943. She arrived at Truk on 7 October 1943.
Ro-37 got underway from Truk on 20 October 1943 to begin her first war patrol, assigned a patrol area east of the New Hebrides as part of Submarine Group A. While at sea, she was reassigned to Submarine Division 34 on 31 October 1943, but otherwise her patrol was uneventful. She returned to Truk in November 1943.
During the second half of December 1943, Ro-37 took aboard supplies from the auxiliary submarine tender Heian Maru at Truk. On 2 January 1944, Fleet Radio Unit, Melbourne (FRUMEL), an Allied signals intelligence unit headquartered at Melbourne, Australia, reported that a Japanese message transmitted from Truk that FRUMEL had intercepted and decrypted said that Ro-37 was scheduled to depart Truk Lagoon via the South Channel at 16:00 on 3 January 1944 and proceed east-southeast on a course of 116 degrees. As FRUMEL had reported, Ro-37 got underway from Truk on 3 January 1944 on her second war patrol, bound for a patrol area off the New Hebrides. The Japanese never heard from her again.
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Japanese submarine Ro-37
Ro-37 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in June 1943, she served in World War II and was sunk during her second war patrol in January 1944.
The submarines of the K6 sub-class were versions of the preceding K5 sub-class with greater range and diving depth. They displaced 1,133 tonnes (1,115 long tons) surfaced and 1,470 tonnes (1,447 long tons) submerged. The submarines were 80.5 meters (264 ft 1 in) long, had a beam of 7 meters (23 ft 0 in) and a draft of 4.07 meters (13 ft 4 in). They had a diving depth of 80 meters (260 ft).
For surface running, the boats were powered by two 2,100-brake-horsepower (1,566 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 600-horsepower (447 kW) electric motor. They could reach 19.75 knots (36.58 km/h; 22.73 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the K6s had a range of 11,000 nautical miles (20,000 km; 13,000 mi) at 12 knots (22 km/h; 14 mph); submerged, they had a range of 45 nmi (83 km; 52 mi) at 5 knots (9.3 km/h; 5.8 mph).
The boats were armed with four internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of ten torpedoes. They were also armed with a single 76.2 mm (3.00 in) L/40 anti-aircraft gun and two single 25 mm (1.0 in) AA guns.
Ro-37 was laid down as Submarine No. 203 on 9 October 1941 by the Sasebo Navy Yard at Sasebo, Japan. She was renamed Ro-37 on 20 June 1942, and was provisionally attached to the Maizuru Naval District that day. She was launched on 30 June 1942 and completed and commissioned a year later on 30 June 1943.
Upon commissioning, Ro-37 was attached formally to the Maizuru Naval District and assigned to Submarine Squadron 11 for workups. On 16 September 1943 she was reassigned directly to 6th Fleet headquarters, and she departed Maizuru bound for Truk on 22 September 1943. During her voyage, she was reassigned to Submarine Division 1 in the 6th Fleet on 24 September 1943. She arrived at Truk on 7 October 1943.
Ro-37 got underway from Truk on 20 October 1943 to begin her first war patrol, assigned a patrol area east of the New Hebrides as part of Submarine Group A. While at sea, she was reassigned to Submarine Division 34 on 31 October 1943, but otherwise her patrol was uneventful. She returned to Truk in November 1943.
During the second half of December 1943, Ro-37 took aboard supplies from the auxiliary submarine tender Heian Maru at Truk. On 2 January 1944, Fleet Radio Unit, Melbourne (FRUMEL), an Allied signals intelligence unit headquartered at Melbourne, Australia, reported that a Japanese message transmitted from Truk that FRUMEL had intercepted and decrypted said that Ro-37 was scheduled to depart Truk Lagoon via the South Channel at 16:00 on 3 January 1944 and proceed east-southeast on a course of 116 degrees. As FRUMEL had reported, Ro-37 got underway from Truk on 3 January 1944 on her second war patrol, bound for a patrol area off the New Hebrides. The Japanese never heard from her again.