on the Hikari Naval Arsenal, resulting in severe destruction. Including this bombing, Hikari lost more than 1,200 citizens in World War II, both military and civilian. After surrender, Allied forces found 52 kaiten at Hikari and destroyed them. The former Hikari Naval Arsenal is now the sites for Nippon Steel Corporation and vaccine manufacturing by Takeda Pharmaceutical Company. Takeda discovered the hull of a Type 4 Kaiten under one of the buildings in August 1989, an attestation to the history of the site. The Kaiten Monument, erected in 1996, honors Hikari Naval Arsenal kaiten pilots. Steel frames that once constituted the structure of the destroyed Hikari Naval Arsenal were used to build the Tsukumo Bridge. References External links Cities in Yamaguchi Prefecture Port settlements in Japan Populated coastal places in Japan