Sick Sad World, named after the show-within-a-show from the animated series Daria, channels atmospheric sludge and post-metal from Nantes since 2012. Their expansive, cinematic approach to heavy music builds from quiet tension to crushing catharsis.

Catania's Sicklown navigate post-metal and sludge from volcanic Sicily since 2001. Over two decades, they have built a sound that pairs atmospheric breadth with the crushing weight that their surroundings inspire.

Now-defunct psychedelic stoner/sludge metal band from Ghent whose members have continued as Bogbogbog, Silent Snare delivered "goosebumps-inducing psychedelic outbursts" across their self-titled 2018 album and 2015's "Darken EP." Their genre-warping sound combined fast thrashy passages with sludgy breakdowns and hypnotic stoner interludes.

Silver Gallery has been dispensing thick sludge and stoner metal from the Marseille underground since 2013. Feeding off the gritty energy of France's Mediterranean port city, they craft riff-heavy jams soaked in fuzz and feedback.

Sinistro formed in Lisbon, Portugal in 2011, initially releasing an instrumental debut before integrating the distinctive voice of vocalist Patrícia Andrade, which became the defining element of the band's atmospheric doom and post-metal sound. After signing to Season of Mist, the band released Semente (2016) and Sangue Cássia (2018), earning praise from peers including Paradise Lost and Cult of Luna and appearances at Roadburn Festival. Their fourth full-length Vértice arrived in 2024 via Alma Mater Records. Sinistro are widely considered one of Portugal's most important metal exports, with Andrade's vocal presence lifting their work beyond genre convention.

Sirens of Crisis blend crust and sludge metal from Leverkusen, combining punk's raw urgency with sludge's crushing weight. Active since 2014, they bring a politically charged, abrasive sound to the Rhineland heavy scene.

Galway's Six Down have been dealing in sludge metal since 2000, making them one of Ireland's longest-running heavy acts. A quarter-century from the west coast has forged a sound of oceanic weight and relentless undertow.

Skythen channel stoner and sludge metal from Hamburg, building hazy, riff-heavy compositions that draw their name from the ancient Scythian nomads. Active since 2015, they bring historical weight to their Hanseatic stoner/sludge sound.

Slave Hands blend doom, sludge, and hardcore from Helsinki, combining crushing heaviness with punk's confrontational energy. Active since 2013, they bring shackled fury to the Finnish capital's underground.