Havoc Unit, formerly known as ...and Oceans, is an industrial black metal band from Finland. It was formed in 1989 as a death metal outfit called Festerday, but soon changed its style to symphonic black metal. It released its first album as ...and Oceans in 1998, and in the following years it pursued a less traditional, more industrial-oriented direction. After ten years of existence as ...and Oceans and four full-length albums, the band changed its name to Havoc Unit in 2005. Its first album under the new name was h.IV+ (Hoarse Industrial Viremia), released in 2008. After five years, in 2013 band's name has returned to be Festerday.