Japanese cruiser Kuma

Kuma (球磨) was a light cruiser in the Imperial Japanese Navy, named after the Kuma River in Kumamoto prefecture, Japan.

Background
After the construction of the s, the demerits of the small cruiser concept became apparent. At the end of 1917, plans for an additional six Tenryū-class vessels, plus three new-design 7200 ton-class scout cruisers were shelved, in place of an intermediate 5,500 ton-class vessel which could be used as both a long-range, high speed reconnaissance ship, and also as a command vessel for destroyer or submarine flotillas. Kuma was the lead ship of the five vessels in this class which were built from 1918-1921.

Design
The Kuma-class vessels were essentially enlarged versions of the Tenryū-class cruisers, with greater speed, range, and weaponry.

With improvements in geared-turbine engine technology, the Kuma-class vessels were capable of the high speed of 36 kn, and a range of 9000 nmi at 10 kn. The number of 14 cm/50 3rd Year Type naval guns was increased from four on the Tenryū class to seven on the Kuma class and provision was made for 48 naval mines. However, the two triple torpedo launchers on the Tenryū class were reduced to two double launchers, and the Kuma class remained highly deficient in anti-aircraft protection, with only two 8 cm/40 3rd Year Type naval guns.

Early career
Kuma was completed at the Sasebo Navy Yard on 31 August 1920. Immediately after commissioning, Kuma was assigned to cover the landings of Japanese troops in Siberia during Japan's Siberian Intervention against the Bolshevik Red Army. She was subsequently based at Port Arthur, and patrolled the China coast between the Kwantung Leased Territory and Tsingtao.

Kuma was refit in late 1934 with a tripod mast, and an aircraft catapult for launching a reconnaissance floatplane, typically a Kawanishi E7K1 "Alf". As the Second Sino-Japanese War began to escalate, Kuma patrolled the China coast, and covered the landings of Japanese forces in central China. In December 1937, Kuma served as flagship for a squadron of minelaying submarines JAPANESE SUBMARINE I-121 through JAPANESE SUBMARINE I-124 based out of Tsingtao until fall of 1938.

Invasion of the Philippines
On 10 April 1941, Kuma was assigned to Vice Admiral Ibo Takahashi's CruDiv 16 in the IJN 3rd Fleet. At the time of the attack on Pearl Harbor on 8 December 1941, Kuma was participating in the invasion of the northern Philippines, having departed from its base in Mako, Pescadores Islands with the JAPANESE CRUISER Ashigara, JAPANESE CRUISER Maya and destroyers JAPANESE DESTROYER Asakaze and JAPANESE DESTROYER Matsukaze. From 10 December - 11 December, Kuma covered landings at Aparri and Vigan; off Vigan, Kuma was attacked unsuccessfully by five USAAF Boeing B-17 Flying Fortress bombers of the 14th Squadron. On 22 December, Kuma covered further landings at Lingayen Gulf, Philippines.

On 3 January 1942, Kuma was re-assigned to Vice Admiral Rokuzō Sugiyama's Third Southern Expeditionary Fleet. She was assigned to patrols around the Philippine islands from 10 January to 27 February 1942.

In March, Kuma was assigned to cover the invasion of the southern Philippines, shelling Cebu harbor on 1 March, and covering the landings at Zamboanga, Mindanao on 3 March. Special Naval Landing Forces (SNLF) from Kuma rescued about 80 Japanese nationals who had been interned.

On 9 April 1942, off Cebu, Kuma and the torpedo boat Kiji were attacked by U.S. torpedo boats PT-34 and PT-41. Kuma was hit in the bow by one of eight Mark 18 Torpedoes fired, but it was a dud. PT-34 was destroyed by Mitsubishi F1M "Petes" launched from the seaplane tender Sanuki Maru.

On 10 April, Kuma covered landings on Cebu by the Kawaguchi Detachment's 35th Infantry Brigade HQ and the 124th Infantry Regiment, and on 16 April landings on Panay by the Kawamura Detachment's 9th Infantry Brigade HQ and the 41st Infantry Regiment. On 6 May, Kuma covered the final assault on the American bastion on Corregidor Island in Manila Bay. Afterwards, Kuma remained on patrol at Manila until 12 August 1942.

Dutch East Indies and New Guinea campaigns
After a refit at Kure Naval Arsenal in September, Kuma returned to Manila on 20 September 1942 and was reassigned to Vice Admiral Shirō Takasu's Second Southern Expeditionary Fleet (Dutch East Indies Force). She was sent to Hong Kong to embark troops of the 38th Infantry Division, which she disembarked at Rabaul, New Britain on 10 October. Kuma then proceeded to Makassar, Celebes where she began patrols until 13 April 1943, with occasional embarkation of reinforcements for Rabaul, Kaimana, New Guinea and Kabui, New Guinea.

From late April though the end of May 1943, Kuma was refitted at the Seletar Naval Base Singapore, and afterwards resumed patrols around the Dutch East Indies to 23 June.

On 23 June 1943, while at Makassar with CruDiv 16's JAPANESE CRUISER Kinu, JAPANESE CRUISER Ōi, and JAPANESE CRUISER Kitakami, Kuma was attacked by seventeen Consolidated Aircraft B-24 Liberator bombers of the 319th Squadron/90th Bomb Group (H) of the 5th Air Force. All four light cruisers were straddled by near-misses, but suffered only slight damage.

On 24 June 1943, CruDiv 16's flag was transferred from Kinu to Kuma. Both cruisers then departed Makassar for patrols around the Dutch East Indies until 23 October. From 1 November, Kuma was refit in Singapore. Her No. 5 140-mm gun was removed as were her catapult and derrick. Two triple mount Type 96 25-mm AA guns were fitted. This brought the total number of Kuma's 25-mm AA guns to ten barrels (2x3, 2x2). Refit was completed by 12 November, and patrols/transport runs around the Dutch East Indies resumed, extending occasionally to Port Blair, Andaman Islands, Penang, Mergui, Burma through 9 January 1944.

On 11 January 1944, after departing from Penang with the destroyer JAPANESE DESTROYER Uranami on anti-submarine warfare exercises, Kuma was sighted by Royal Navy submarine HMS Tally-Ho (P317) based out of Trincomalee, Ceylon. Approximately 10 mi northwest of Penang, HMS Tally-Ho fired a seven-torpedo salvo from 1,900 yards. Kuma's lookouts spotted the torpedoes' wakes, and although the rudder was sent hard over, Kuma was hit starboard aft by two torpedoes, setting the ship on fire. Kuma sank by the stern in the vicinity of 5.43333°N, 99.86667°W detonating her own depth-charges. Uranami took on survivors, including Captain Sugino, but 138 crewmen perished with the ship.

Kuma was removed from the navy list on 10 March 1944.

The Wreck
Kuma's wreck was discovered in March 2004 by Australian diver & photojournalist Kevin Denlay and a group of divers operating off the research vessel Empress, based out of Singapore. The ship was found to be on her starboard side in 155 ft of water, covered in fishing nets and snagged fishing lines. The bridge structure was fairly intact, although half-buried in bottom silt, and her funnels had fallen off. The port side waist 5.5-inch gun was intact, save for the top of the mount enclosure, which had disintegrated. The circular rotating base of the forward port torpedo rack was intact, but there were no torpedo tubes mounted on it. The aft mount of the same structure had fallen off. The glass in many of the portholes has been melted and fused due to the fire that raged amidships while the vessel was sinking. The ship's stern was missing completely; all that remained was a jagged edge, but the outboard port propeller was still in place.