JS Chihaya (ASR-403) is a submarine rescue ship of Japan Maritime Self-Defense Force.

[1] For DSRV operation, the basic configuration of having a moon pool in the center of the hull is the same as the 56AS, but the poop deck has been extended to the vicinity of the bridge structure, and the standard displacement has been increased by 1,800 tons.

In addition, attention was paid to high-speed cruising ability so that the vessel can quickly advance to the distress site, a bulbous bow was adopted to reduce wave-making resistance, and a ship bottom closing device was installed at the bottom of the center well.

As a propulsion device, in addition to two variable pitch propeller axes, two side thrusters are provided on the bow and stern.

[2][3] The ship participated in the International Submarine Rescue Training Pacific Reach 2002 held in April 2002.