Undertow is Tool's first full-length album, released in 1993. During a time when grunge was at the height of its popularity, and radio friendly pop punk slowly emerged, Undertow helped metal remain prominent as a musical style, and allowed several later bands to break through to the mainstream. The All Music Guide sees the album's success in the "striking, haunting visuals that complemented the album's nihilistic yet wistful mood" — it was eventually certified double platinum by the RIAA on May 14, 2001.