This article is about Michiru Kaiou's violin. For the building where the Sailor Senshi fought Eudial in the anime, see Marine Cathedral.
Marine Cathédrale is the name of Michiru's violin. During one of her concerts, an audience member states, "I hear that her violin is a five hundred million yen Stradivarius named after the temple of the sea."
Michiru, as Sailor Neptune, is also able to use her violin for attacking, as she used it to perform an unnamed sound attack in Act 30. She is also able to perform two attacks with her violin in the manga: Submarine Violin Tide and Galactica Violin Tide.