JS Chiyoda (2016)

Chiyoda was laid down on 13 October 2015 at Mitsui Engineering and Shipbuilding, Tamano and launched on 17 October 2016. The vessel was commissioned on 20 March 2018.

After 15:00 on 1 May 2018, five men and women fell from a pleasure boat sailing in the vicinity while anchoring off the coast of Ito Port in Shizuoka Prefecture for a temporary stay for individual ship training in the north of Hatsushima, Sagami Bay. The crew visually recognized it, and to rescue the drowning man, they lowered the work boat from the ship and carried out rescue and rescue activities. On June 14, the same year, Japan-US hygiene joint training was conducted with the Self-Defense Forces Yokosuka Hospital, Yokosuka US Navy Hospital, and the US Navy Mercy-class hospital ship USNS Mercy.

Before dawn on 26 May 2019, two cargo ships collided at sea about 11 km south of Inubosaki in Choshi City, Chiba Prefecture. The captain, who was rescued about two hours after the sinking of the Chikatsu Maru (5-seater, 499 tons) owned by Katsumaru Kaiun in Imabari City, Ehime Prefecture, said, "Everyone was on board when the collision occurred." One was found on board the ship on the 26th and was confirmed dead, but a sound was heard in the second Japan Coast Guard diver's investigation from around 0:30 pm on the 27th, and even after five dives in the room. I^[who?] confirmed the sound near a certain stern. When a diver hits the hull with a plastic hammer three to four times, a slight tapping sound is heard after a few seconds, and the missing person may be in a place where air remains on the ship. The person was rescued soon after.^[1]

From October 16 to December 7 of the same year, Chiyoda was dispatched to participate in the 8th Western Pacific Submarine Rescue Training (Pacific Reach 2019) sponsored by the Royal Australian Navy. The training was conducted from November 4 to November 15 in the waters west of Perth, Australia, and the participating countries were the United States, the Australian Federation, the Republic of Korea, the Republic of Singapore, Malaysia and 20 observer participating countries in addition to Japan. The Exercise included: submarine rescue training, search and rescue demonstrations for distressed submarines, etc.^[2]

Chiyoda participated in Exercise Pacific Reach 2025 (XPR 25), a biennial exercise hosted by the Republic of Singapore Navy (RSN). The exercise included a harbour phase, between 15 and 20 September, at Changi Naval Base, Singapore and was followed by a sea phase from 21 to 25 September in the South China Sea. This phase saw the participation of two other rescue units embarked on their respective submarine rescue ships, INS Nistar and MV Swift Rescue of the Indian Navy (IN) and the RSN along with the submarines of Republic of Korea Navy, RSN and Japan Maritime Self-Defense Force (JMSDF) which simulated as Disabled Submarines (DISSUBs). The DISSUBs included ROKS Shin Dol-seok (SS-082) and RSS Invincible. On 25 September, a coordinated rescue drill was hosted by RSN. This was a "three-asset rescue (R3)", the first-of-its-kind in the history of Pacific Reach. Nistar led the formation, assisting the other rescue ships by localising and surveying the datum and then passing requisite information to Swift Rescue and Chiyoda. While Invincible simulated as the DISSUB, India's ROV and DSRV Tiger X, part of the Submarine Rescue Unit (East), were deployed and the mating was completed within an hour.^[3][4]

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  JS Chiyoda at Kobe on 2 September 2017.
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  JS Chiyoda at Kobe on 11 November 2017.
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  JS Chiyoda at Kobe on 11 November 2017.
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  JS Chiyoda at Kobe on 11 November 2017.
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  JS Chiyoda at Kobe on 11 November 2017.
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  JS Chiyoda at Kobe on 11 November 2017.
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  JS Chiyoda at Kobe on 11 November 2017.
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  JS Chiyoda at Kobe on 11 November 2017.